Lack of proper customer service

On the 12 Nov 2015 i received a statement from the RSC group that payment for my account had not been received . I contacted the customer care line and was advised to send a proof a payment. i sent a full bank statement highlighting that the payment of R1700 had been made on the 21 of Oct at one of their stores and that i had paid via debit order. I received an email today but addressed to another Client and not myself advising me that my comprehensive bank statement was not \sufficient proof of payment."Called their offices to inquire if the email was for me because it was not addressed to me and i did not receive a follow up email correcting the error or confirming it was indeed intended for me. I'm told that it was meant for me and that they made a mistake addressing me on another Client's name and i'm also told that my official bank statement setting out the payment made and store was not sufficient and that there is no better proof than a slip. It is clear they received payment. however i won't be helped unless i go back to the store 40 km from where i am to get a receipt and send it to them. I'm disgusted at the poor service and lack of assistance even with a statement. """