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Can a company charge you for services never requested or received?
I have had a couple of businesses do this to me.  I simply ask them to come over to talk about the bill.  Sometimes this ends it.  If they come over then I call the cops to file a report on fraud.  A lot of times the police will do nothing unless they have had a load of complaints but it certainly gets the company off your back.  And if they are truly unscrupulous it doesn't hurt to get a picture of them talking with the police and their van, and then post the whole situation online - you will see others come forward really quick after doing something like this.