Discount supermarket Aldi is under fire for failing to notify customers of credit card fees six months after it promised the corporate regulator it would. The Australian Securities and Investments Commission (ASIC) took action against the supermarket company last year after an investigation revealed it did not disclose a 0.5 percent surcharge placed on transactions made using tap and go contactless payment systems in any of its stores. ASIC also found that ALDI failed to disclose the 0.5 percent surcharge it charges consumers paying by credit card in some of its stores. Scroll down for video . Discount supermarket Aldi is under fire for failing to notify customers of a 0.5 percent surcharge on credit card fees six months after it promised the corporate regulator it would . Aldi told the regulator it would put up signs at the entrance of stores and at registers to notify shoppers of the surcharge, as well as have cashiers inform customers before payments were made. But Fairfax Media reports that Aldi has not consistently disclosed the surcharge to customers and many were unaware about the additional fees. Some stores still do not have signs at entrances and signs at the registers warning of the surcharge are in tiny print. A spokeswoman for the supermarket said Aldi had carried out an audit last year to make sure appropriate signs were visible. 'If for any reason an Aldi store does not have the required signage, we will ensure that this is corrected immediately,' she said. The Australian Securities and Investments Commission took action against Aldi last year after an investigation revealed it did not disclose a 0.5 percent surcharge on transactions made using tap and go . Some stores still do not have signs at entrances and signs at the registers warning of the surcharge are in tiny print . Under the ASIC Act, retailers that fail to adequately disclose surcharges, or create the impression that surcharges do not apply, may be considered 'misleading or deceptive'. ASIC Deputy Chairman Peter Kell said retailers needed to disclose credit card surcharges. 'Merchants need to be transparent about fees and charges where credit card surcharges apply so that consumers can consider using other payment methods without any additional costs,' Mr Kell said. 'Consumers should also be mindful that payments by contactless or 'tap and go' cards are currently treated as credit card transactions, meaning that fees may apply where there are surcharges in place, even where they are using a debit card.' In ALDI stores all credit card transactions and all tap and go payments attract the 0.5 percent surcharge, irrespective of whether customers use a debit or credit card. An ALDI spokeswoman said it has always charged credit card surcharges to 'cover the costs associated with the service'. 'ALDI is aware there are high costs associated with accepting credit cards,' she said. Aldi told the regulator it would put up signs at the entrance of stores and at registers to notify shoppers of the surcharge, as well as have cashiers inform customers before payments were made . 'However, rather than inflating prices across the board, to compensate for the credit card acceptance costs, ALDI prefers customers to make the choice themselves.' Tom Godfrey, spokesman for consumer group Choice, said many shoppers were unclear about the charges that can come with using tap and go. 'Most people don't realise that tap and go relates to credit so obviously if you're using a credit facility surcharges can come with that,' Mr Godfrey said. 'What we take issue with is whether the surcharge is at a reasonable level, and what we have seen is excessive surcharges going on. 'The surcharge at ALDI is not excessive, but I don't think it's great they're charging a surcharge on a debit facility, so people's savings accounts.' Mr Godrey said shoppers needed to ask about surcharges before using tap and go. 'I think it's always important to ask - as you've seen with ALDI, you might assume there isn't a surcharge because Coles and Woolies don't have one,' Mr Godfrey said. 'If you're going to use tap and go you should ask what the surcharge will be, then ask for a surcharge free option.'
Aldi under fire from corporate regulator for not disclosing credit card fees . Australian Securities and Investments Commission took action against the supermarket last year after it failed to notify customers of surcharge . Supermarket agreed to putting up signs and have cashiers notify shoppers .