********** Debits and Incorrect ITC updates

I have been debited by AMC Classic for 2 months in a row and had to get the debit orders returned. Upon calling them and speaking to an agent Yolandi, no can explain to me why they are **********ly debiting me as I have no accounts with them. They keep saying they will call back but never do. Neither can they supply with documents showing I signed any contract, All cookware I did buy from them was done in cash. Further to that I pulled out my ITC report and it reflects that I am 2 months in arrears with AMC. They have ruined my ITC credit score with incorrect information. Please can someone sort this out immediately.