Homechoice and their unskilled debt collectors

My account was in arrears, I then phoned the number their debtors collectors ad requested settlement amount. I was talking to Lerato, she then gave me an amount over the telephone(R 3000.60). I paid and even received an sms from them thanking me for it. After 2 weeks I receive a call from the debtors collectors saying I owe R97.00. I asked how was that possible and why was i given a wrong amount if that was the case. Different people told me I had to pay cause I took home choice's products. I didn't want to argue and I figured since it is R97 then it is not a big deal and they were harassing me with phone calls. I then requested that they send me something in writing so I may not repeat the 1st mistake of paying with an amount I was given on the phone. They do keep telling me that they can't send me, they do not have access to emails and even when I ask for an sms they tell me they can't. I keep accruing interest and I can't get help from them, now I don't how to pay and how much because if I do they might tell me I didn't pay the full amount. They don't go through the records they just call me,according to me they didn't give me the correct amount or they decided to add R97.