Poor service

I have been trying to clear my truworths account, I have paid up my bill from truworths and the mbd attorneys called and says I'm still owing around R700 something on their side since the account was handed over. I asked them to send me proof and where I can deposit the money that is left. They said they going to send me proof I gave them my address still nothing its been 2 months now.i want to get clearance letter I also tried calling them it just ring and goes unanswered. I want to buy a house but I cant because I need clearance letter from them to be cleared on credit bereau.