russels mislead the pensioners!!!!

my mum purchased a deep freezer on her nameon the 20/2/2016 and because she is amputated the lady from the store came to car for her to thumb print the documents i asked the lady if the payments could go off my bank she said it was not allowed as the account would be in my mums name. she then requested that i get a bank statement from sassa which i did then wanted my mums grant card to sent to the store which i did as we were told the payments will come off my mums account, at the end of march no payment came off , then got a call on the 12/4/2016 saying she is now in arrears for R712 and payment must be made by the 16/4/2016. the installment was told to us would be R320 a month but now R712 is asked. at no point the lady was with us did she tell us to come instore and make payment. i called the store today and spoke to accounts on a recorded line nd was told they went against CPA by coming out to the car for my mum to sign documents but failing to understand that the payment method was not advised , we didnt get any form of paper work to read just the lady stamping my mums prints without explaing we shouldnt be in arrears if the payment was taken correctly.