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Changing Bank Account Number regularly to reduce fraud
We change it every so often to reduce fraud. If you're absolutely sure you didn't just send money to a scammer impersonating a landlord, this has nothing to do with fraud-- they're playing a game with you. By changing the account number frequently, it makes it more likely you make a mistake in entering the payment account. When they come back to you a few days past due saying "we never received your rent," you'll eventually realize it got sent to the wrong account. Now you owe them late fees, and there's really nothing you can do about it-- you did not in fact pay them on time; you sent it to the wrong account! It's an easy way for them to collect an additional few thousand dollars a year. Anytime a small business or landlord says they have to do something "weird" to reduce fraud, chances are it's a pretense to you getting hosed in some way.