switched to prepaid

So... I get an sms that states that both my contract numbers have been switched to prepaid without my knowledge. I then called to find out what is happening matilda then promises to come back to me before end of day on the 5th Aug which never happens. I then call again and spoke to someone else who then advises that I will get feedback by next week latest. What's annoying is that she said that I had put this request in Apr already . During that month I had been *****ed by mtn on an upgrade which resulted in loss of airtime which I never recovered. This year alone this company has given me drama and have lost faith and respect. I would rather seek another network and not stay with the devil I know. Would be nice if and when they find the recording it can be forwarded to me