The worst service in south africa

On the 7th may i upgraded my cell phone contract. The new contract was suppose to be R209 p/m end of may R398 was deducted en of june R370. I was suposse to get 75 min air time and 700mb data i have not received this to date. The branch logged 8 queries i send 9 emails and every time they say the problem has been resolved but nothing was resolved i am fed up with mtn you can not complain about the service because there is no service. If this is not resolved within 5 days i am going to stop my debit order. I hope you guys can help