Billing inconsistent

I had a standard bank credit card that was handed over to Brooks and Luyt. I have being in and out of jobs and now want to settle the account in full. I had requested a full statement since the account was handed over up until October 2015, however i have a query with the statement of account. I was once quoted R13 800 in April 2015 over the phone and this amount is not on the statement I received in October 2015. When I query it, they are telling me its due to charges. I have asked them to state the amount on the statement and their charges however they haven't responded till today and they are threatening to process with legal action. <br> The account is outstanding by R14 542.34, I have paid R4 850 since it was handed over and R16 314.56 was handed over. I have asked for settlement discount