misleading of price

I purchased bag set and was told repayment will be R40 a month. Last month I received a statement stating my account is in arrears, I immediately contacted the accounts department to query as I proof of all payment. The call centre agent reassured my account was not in arrears and I was giving a reference number for the call. Then this morning I received a sms stating I need to pay R105. I then called the call centre and was told my account is in arrears as I was supposed to pay R57 not R40. I was shocked as I called in last month and I was not made aware off that amount. Never again will I purchase anything from homechoice, total *******!!!