Below par service from MTN

The Yellow Bucks from MTN is a farce . On three occasions I could not use my vouchers , I have logged these issues , spoke to a certain Phindile Buthelezi at the High Value Centre , send her mails got absolute no response . made several calls to MTN Customer Care where I was promised that the Supervisor at the High Value Centre will call me back , got no call back. out of desperation and being hopefull , on the 09th January I send all my three issues to the MTN Complaints Department , 15 days later and I still have had no response . Now I need to decide to renew my contact with a Company that has no idea how to assist their customers with their issues, what is great about my contract is that it has already expired as such I dont even have to give notice, just migrate my number . In my opinion MTN Service is more useless than a certain Telekoms Company in SA. Does the CEO of MTN know how useless MTN Service is ??