MTN's shocking customer service

After being cold called by a pushy agent to upgrade my contract and agreed to with the understanding theres a 14 day cool off period I phoned the very same day to reverse the upgrade. After waiting on hold for numerous phone calls and speaking to about 2 or 4 agents i finally was able to reverse the contract but they put me onto an incorrect package which is substantially more than what I used to pay, after further phone calls and queries being logged to remedy I eventually had to go into store to get help which they did but now I'm being billed for the old package + handset for the 2 months after reversal request. I've been into store and they cannot help me either because emails for escalation dont get responses. STAY AWAY FROM MTN. its been the worst customer service I have experienced in my life.