Dropped by the "upgrade"

After having my account with MTN for 25 years, with the original number issued, and multiple contract upgrades, on 6th July 2021 I was called by Elizabeth. She advised me that the contract I was on was falling away, and they were upgrading it with no extra cost to myself. Currently receiving 1GB data, 200minutes airtime etc, the upgrade would offer me, with no extra cost to myself, 2GB data, 500minutes airtime and R38 (or something) international calls. As my instrument is paid off, R299 is the same amount that would be billed each month - nothing different but a much better deal. In addition, I was advised that should I NOT go with this package adjustment, I would automatically revert to a "pay as you go" prepaid customer, which didn't make any sense because I was on a contract. So I agree. I get multiple sms's and emails confirming the update. However, 7th July 2021 I have no data at all. Unless I am in a wifi zone, I cannot access Google, Maps, Social Media, Emails etc etc. I think it's perhaps taking a day or two to activate, but at 12th July, still nothing. I went to MTN Cavendish Square to enquire and was told the new package actually is 1GB social media, 1GB normal internet, whatever the minutes call time but ... the catch it is only kicks in on 27th July 2021. So in the meantime, I have no connectivity!!! How does that work? Apparently until then I must purchase prepaid data and airtime to sustain myself, and then from 27th to 27th of a month, I'll be billed the R299. This was NOT explained to me. And how can a contract just be dropped like that? I am so livid - I run a business, and a loyal customer of MTN and it's disgusting to be treated like this. Disgraceful!