Breach Of Contract/ ***** on my Account

after I had done my upgrade I checked my Airtime and I had around 55 anytime min and R52 airtime. I made a call and while on the call it said 1 min remaining. I cut the call and checked my balance and it was the same. I made another call and it went through as I thought it was a technical error. the next day I get an sms from MTN to recharge as my data is finished. when I checked my balance it showed 0 min and R0 airtime. when I called MTN to Query this they advised me that call where made for an hour that same morning at 2am and then at 10am for 45min which is ******* as I am in church from 9am on a sunday. I managed to get a hold of another manager at MTN which after of numerous calls, said she will refund the lost airtime which she done immediately, but for the refund of the min she had to log it with the billing dep. it has been 4 weeks later and nothing has been done. in the interim I have been speaking to a Manager Mark Haywood who advised me that no logs have been made and he will sort it out but nothing has been done even from him as he doesn't even respond to emails. I have advised him that I will not be paying for account until this matter is resolved.