Billing issues and incompetence.

Have been trying to add a new credit card for payment of my Superflex which will lock on 6th Feb due to non-payment. Every response has been from a different consultant, none of who appear skilled enough to resolve my problem. They all tell me to uninstall the app and reinstall, or try again. The last one told me to visit an MTN store. The consultant there was equally as useless. I have asked for someone from their billing department to contact me, but nobody does, so i guess my MTN service will terminate on 6th Feb and I shall have to go back to Vodacom. How does a company with such shocking service survive?