Extremely unhappy with MTN

I would like to say that I'm not happy with MTN. I'm a customer that pays almost R6000 to MTN a month and that has never had any issues with them. This month 2 of my numbers had to upgrade with them. I called a month before to confirm that I can upgrade and all the consultants at MTN I spoke to said all is fine and never told me about any process change. Fast forward to June 2021 the month that all the consultants I spoke to told me I can upgrade and now they say the process has changed. I was never told about it and also none of their consultants told me prior to that when I enquired. I want o be upgraded with none of the nonsense that MTN wants as that wasn't the agreement I signed for at the beginning. I've never agreed to any of this and as a big client of MTN I at least expect better treatment, this is not on. Clients must be sent a review of contract and must first agree to this I'm not happy and if I could my language wouldn't be this nice either. I need an executive MTN or someone prominent to call me ASAP. I want no excuses from MTN.