Totally no service never mind bad service

In March 2015, I changed my 2 contracts to top up, April's account comes and the one account is sky high nearly R2000, I go in and complain, nothing gets done. Upgrade a 3rd contract, change that to top up as well, get mays account still not fixed and accounts still going over the \top up". June is obviously the same as I am now suspended on all 3 contracts for apparently reaching the R3200 credit limit. How on earth does one reacha limit like that with contracts that are supposed to be on top up. Mall @ carnival branch has been dealing with me for 6 years and yet now Chantelle who promised to sort it out in May after I was to send her an sms has still done nothing. I must just keep paying ********** bills as nothing has been sorted out and the excuse for 3 months now is that they can not help it as MTN is on strike. I find this totally unacceptable. I contacted mall @ carnival on thursday again and chantelle could not talk to me as she was busy gave the phone to christo who promised to call back"