Billing expired and cancelled contract

I have given notice to Telkom to terminate my contract 30 days prior to its expiry date as per instructed by one of their agent. this was on October for a contract expiring on the 28 of September, all I requested was for my number to be converted to pre-paid. but now the contract is still active, end of September they were suppose to bill me for the last time but they proceeded and load the data and minutes regardless<br> I called in and enquire, they logged me a case and gave me a case number and told me to wait for an agent to call me back, I'm still waiting, I called in again close to end of October, they told me the case has been assigned to someone they will call me within 72 hours, no one called me, then on the 25th they billed me again.<br> <br> now on the 1st of November they loaded the data again, for a contract that ended on September and was cancelled on august. this is 3 months later. which means they are going to bill me again end of this month, <br> why do I have to die first for Telkom to cancel the damn contract? this is unacceptable at all