MTN online purchase gone awry

I purchased a phone online on the Flexi 220 contract,

I ordered a black Note 10 lite with R220 airtime, asked the sales consultant if I could keep my existing number and they told me I would need to insert the sim into the new phone, get it RICA'd and then dial a USSD code to change it to my existing number.

First of all, I received a silver phone - I ordered black Then, when I checked I received R28 airtime instead of R220 I then followed the instructions given by the call center agent, only to be informed that it cannot be done with a contract, only prepaid. So I was stuck with this new phone, in the incorrect colour, with the incorrect amount of airtime and the incorrect phone number. I then returned the phone to an MTN direct store and requested them to cancel my contract. I was told in store that the device would be sent back to JHB and then only once it was received they would "start to process the cancellation". I told her, by then I would be debited, only to be told that a refund "could be processed". I really do not wish to be debited for a mess MTN created only to wait for a refund to be processed. I am writing this because I still have not received feedback on whether my contract is cancelled and I was already informed that my bill is ready.