Central Subscription Service illegally took money from my bank account, charging huge fees over $500 for magazine subscriptions Ramsey, Minnesota

A company claiming to be Central Subscription Service illegally took money from my bank account.  I had to get my account number changed which the bank charged a fee to do.  Then this company began harassing me through the mail and by phone saying I owed them over $500 for three magazine subscriptions I did not order and have not received.  Threatening collection services, etc.  I told them I didn't order anything from them and don't want to order anything from them but they were very rude and said I owed them the money even though I haven't received anything!  They said I couldn't cancel the order for the magazines that I didn't want and said they had me on tape requesting the order.  When I asked them to play the tape they refused and changed the subject.  I am elderly person on a fixed income and feel this company is targeting elderly people such as myself and trying to charge big fees for a phony magazine subscription scam.  They need to be stopped.  Please advise what can be done.  Thank you.