Miss leading

received a call from the call centre to settle my Truworths account with was R2300, the agent said i can settle the account at R1600, so i asked him if i can settle it in terms, he said yes. i contacted the call centre a week ago and they said that i have paid R1500 and that i still have to pay R800. that was not the agreement and now they saying that they cannot help me, the only thing they can do is to give me a 20% discount. please can someone from the company get this resolved