Useless assistance costing me a home&car finance

I had a previous complaint about the bad service of settling my account after providing proof of settlement. After my complaint of Hello Peter Penelope assisted me in helping to settle my account. She made It out as if it is my fault that I received the wrong settlement amount. And after I paid my final settlement and sent through the proof to the email address they provided. She failed to get the proof of payment. Even though I have read reports on my side. The audacity of sending an email stating that I am liable of the outstanding amount was the last straw. I once again sent through my proof so settlement. A wonderful man named Andile in the call centre assisted me, found the proof of settlement. Allocated it to finance. Due to the whole delay since Sept 2014 and not providing me with the right details, I now have a bad credit record because the people at RCS cannot do their jobs properly. This has cost me a home and a car as they did a credit check and it reverted back as negative. I do feel that I am being treated unfairly and am struggling because of you. I am demanding compensation and all my instalments back wit 21% interest. By Friday 13/02/2015. NO EXCUSES!!!