Never use mtn

I have such problems with mtn. I bought a phone last year so to get a good credit score cause we want to buy a house. I stated numerous times on the recording that it must be a fixed amount. I just want to pay the instalment. I was asured over and over again that the sim is blocked. It will be a fixed acount. LIES!!! I gave the ohone to my son (30years old) My son has free wifi at work. And knew he cant load data. First few months was perfect. Money went off as was discused. Then the amount start jumping. I went to mtn springs and complained. Very rude people there. Told me my son loaded data. So my son went on the app that showes how much data he bought. It said 00 data was bought. I told the lady to fix this cause i refuse to pay the exstra. Next month same story. But a higher amount. I went back. Still rude. Got no where. I asked for banking details. I will transfer the money myself. I was given a refrence number for when i do eft. We took the mtn sim out BROKE it and gave my son a telkom card. I proceeded to make eft payments. Then mtn deducted over 1000 from my acount. I closed my bank acount so it wont happen again. Still im paying instalments every month. Instalments. NOT the data they said we loaded. Loaded on a sim i asked from day 1 to be CLOSED. I then went to Nigel mtn. Much beter service. The guy said i did not pay instalments for 3 months. I was horrified. Cause i did do eft payments. He asked for proof. Wich i gave him. Drew bank statements. He checked and saw mtn springs gave me the wrong ref numbers!!!! For 3 months i paid someone elses acount. He would sourt it out. Still waiting. Now im paying instalment ONLY in an mtn store so they cant say i dont pay. Now my acount is in arears by over R2000!!!!!!!!!!! I opened this acount to buy a house and now my credit is in a mess. I phoned and phoned. Semd email after email. No one is sorting out this **** for me. I really need this sorted. I will NEVER advise anyone to buy on contract by mtn. They DONOT listen when you ask to close a sim. Then they tell you you (the customer) is lying. You did load data. My dear first of all YOU AS MTN where supose to close the sim. Secondly the card is broken. Why is it getting higher????