No Communication possible

This have been going on for the past 2 months already with my contract for R69/month which was all of a sudden R104 last month and after complaining they said a credit will be passed on my account however they still debited R104 on my bank account this month now my latest statement is for R79 and I presume that they will debit this amount to my bank account next month NO RESPONSE FROM MTN ON MY e-mails AND THEIR 808 IS NOT WORKING - DO I STOP ANY DEBIT ORDERS IN FAVOUR OF MTN BECAUSE OF PATHETIC CUSTOMER SERVICE?<br> WILL RAELY RECONSIDER NOT TO EXTEND MY CONTRACT WITH MTN IN FUTURE ALTHOUGH I HAVE BEEN A CUSTOMER OF MTN SINCE THE 1980's<br> ABSOLUTULY PATHETIC