No feedback from MTN

Called on the 30th to upgrade my contract. Spoke to Brett who said he'll have to cancel my current data contact to sign up a device contract. Gave me the cancellation fees and everything. We went through the whole application process and he said he was going to call me back in 15 minutes. It's been a day. I've called 8 times. They don't seem to know who Brett is. They transfer me to somewhere else and I hold for over half an hour before the call cuts. I stick with MTN because they're the best network but they have absolutely no customer service