New contract not loaded correctly. Additional bill

Upgraded my contract in April. At which point my data and calls were being billed out of bundle as the bundles were not loaded. I have complained 5 times, each time to different useless call centre assistance, each one promising to escalate this to a supervisor. I am now still being billed out of bundle rates for data, and data not loaded. Additional charge s on my account and no one can give me explanations, or advise when this will finally be sorted out. This is the second time I've upgraded with MTN, and it's the second time this has happened. I have emailed MTN directly without response. I expect a call! From someone who can sort this out. Not someone who will need to escalate it without any response. The constant lies, unprofessionalism, and disregard for finance. They expect your bill paid, even though it's incorrect, otherwise they will simply cut the line off.