Disguting attitude

I am utterly appalled. After renewing my contract having had issues with the first one, believing that things had gotten better. My airtime goes missing and I have to call back 4 times in 1 week to re-explain the issue, only to be interrupted, argued with and then put on hold for 15 minutes and then get hung up on. I call back only to be informed the supervisor is out for 20 minutes after being told I was going through to him. And 30 minutes before this call I was also called by the MTN call center for a promotion by an agent as if she were my friend, no professional etiquette! What kind of unprofessional company and brand is this! I will be cancelling my contract and moving to Vodacom as they seem to be the only company who cares about their customers. This is utterly disgusting! To make matters worse i was told my query was resolved when i am still missing airtime! Beyond frustrated