INCORRECT SETTLEMENT

I receive a settlement letter from Mr Langa on the 18/8/15 &confirmed on the phone before i receivd his email. I paid what was askd& sent the POP as requested.I spoke to Mr Langa which said that I can collect my licence papers,he asked if he can courier them to me.But I said I will make a plan to collect it.This tells me that the account has been settled.A wk later, on 27/8/15 I receive an email saying my account has not been settled.REALLY? I spoke to Ms. Sera today that now say that the settlement amount which was given to me was incorrect,after I paid the car in full.She used the term \Clause"in the quote that was sent to me.Fine print? Please read what you sent me and tell me if you see any fine print.According to the information that was given to me when I made the payment"