Misleading and incorrect info

I have received a call from one of the Norton Attorneys consultant on the 13 -09-2018, it was a lady and she said if I pay R550 I will settle my Account by December 2018 and the remaining amount that I need to pay is R2200 . Then I received a call today and they telling me that I need to pay R2000 again, and I explained to the lady called lindiwe that I have received call saying that by December 2018 I will be settling my Acc and now they want me to pay another R2000. Lindiwe said the person that called me previously did not explain everything. How is it my problem that the lady that I spoke to didn’t give me the correct information because to my knowledge I am done paying the Norton Attorneys in respect of Markhams Acc . This is not fair