Cancelled SIM

I had a post-paid Data SIM with Cell C. I phoned in July to terminate the contract post the contract period and to convert it to pre-paid as I use the SIM as a backup SIM for a "home phone" and if my Fibre internet is down. After a lengthy call an more than one call centre I was told the sales person deactivated the SIM and has to reactivate it and that they would contact me. More than a week alter and still waiting. Please assist reactivating the SIM on pre-paid as I'd like to keep the phone number ...