Cell C struggles

I was contacted on 17 November 2020 to find out if I would like to upgrade my contract with Cell C to which I agreed as it would save me time from having to go in store. I was not informed that the cellphone I selected was not in stock, on 26 November 2020 I followed up as the delivery was taking long and only then was I informed that they don't have stock . To date I have not received the cellphone and have now tried numerous times from 02 December 2020 to cancel the upgrade to allow me to go in store still nothing. On 02 December I was informed it would take 48 working hours, on 06 December I received an sms stating my contract in ending taking it to have been cancelled I went to a store to be informed the contract is still reflecting. The upgrade is still not reversed and now Cell C calls me to offer me insurance on the upgrade to which I don't have the phone and been struggling to cancel the uograde