Time to move on....

i keep cancelling my expired contract in favour of prepaid but they keep telling me its cancelled when it iis NOT. Furthermore, they keep billing me for an outstanding R345 I have already paid. Now my USSD is not working and I cannot check my balance to find out if its an airtime issue. I cannot purchase airtime either from phone or laptop. They used to give good service in the good old days..135 either does nothing or cannot get the right department