termination of contract

I have called several times and sent an e-mail requesting the termination of my contract after it has expired and that it should be converted to prepaid. Five days later it has still not been attended to. The irritating part is that i have to hold for at least 10 minutes listening to their irritating music, the get cut off. Call again and endure the trauma only to be told that all the supervisors and managers are in a meeting- daily for that matter. The call centre agent advised that she is not authorised to terminate the contracts. If people responsible are forever in meeting, who should assist us and when. I truly regret the day i walked into an MTN store. What's surprising is that when you call the prepaid call centre, it gets answered very quickly, but post paid is truly traumatic. If it's their strategy to move all post paid clients to prepaid, then it sucks. My advice is: avoid MTN post paid by all means possible.