Angry for wrong client debited

I am very angry. This is *****. I am not their client they debited my account again after giving ms back my refund they used my banking details for the refund to debit my amount again. I need this business to be stopped. We are approaching December how many people like me are going to be ******. Spoke to the manager Mandy she promised me my account will never be debited ever again. Guess what I got my refund in September only to be refunded and debited again now 24 October. I have no agreement with them. Can this business close this is against my rights . I'm violated. I filled in a refund form and had to fill in the refund form with my banking details kante they using my details on that form to debit my account. Please hold Mandy Manger accountable because she assisted me with finance department and assured me my account won't be debited guess what today 24 October I'm debited 1350 plus 149.00 why??the call centre agent so rude to tell me they knocking of they will attend my query Monday.