Bad accounting service

I have been having account problems for a month, according to mtn i did not pay for the month of june of wich i did, since the 1st of August i have been in and out of mtn at blueroute mall, every week they disconnect my line and i have to go in for them to open the line, i have sent confirmation of payment and i have givem them my bank statement, today on the 31st of august i am still being disconnected and told i owe them double the amount due. Until the matter has been resolved, not another payment will be received from me.