VODACOM left me with no data

I app**** for the Vodacom 1TB deal of R 449 on 18/11/2022 and was approved. The sim card was delivered and activated. Yesterday, 30/11/2022 Vodacom had a Black Friday special of 800GB (400GB+400GB nightowl) for R 349. I then called Vodacom and asked if I can change to this deal. They advised that I have to cancel the 1TB deal and take up the 800GB deal. I proceeded to cancel the 1TB deal and then app**** for the 800GB deal. On 01/12/2022 I called to follow up with Vodacom as I got an email that 'Your number *** has been converted to pre-paid. ' I queried this and spoke to Nokwanda who assured me that the 1TB deal was cancelled and the 800GB was active. That's good because that is what I wanted. A saving of R 100 pm. I then got an email from Vodacom later that my application was declined. I spoke to Phindile who then advised that she can't assist as the contract was cancelled and it doesn't show that I app**** for another contract. I have spent well over two hours on the phone trying to get this sorted out. I am now left with no data contract. Why was my new application declined when I was approved a week ago and I also recently got approved for my fibre line. I need this to be sorted out. I need my 800GB data contract activatd.