Paying for data Sim that should be canceled!!!

In October 2022, Cell c contacted me to upgrade one of my data Sim card, ***, I declined and they advised that it was updated on the system that it would not be upgraded. Then in December 2022, I then received another call to upgrade, I declined, I then checked my statement of account and contacted CEll C to advise them that I would jot be upgrading and would no longer need the data Sim card, I was advised that I could not upgrade but should try again in 3 months, which defeats the purpose of my email. Again on the 11th Feb, I contacted cell c, querying why I was being billed for the data Sim card, I was advised that someone would contact me in 24 to 48 hours, days later, cell c has still not contacted me. The best part about this situation is that I HAVE NEVER RECEIVED THE MODEM AND SIM CARD that I pay for religiously every month. Cell c ****s people.