Vodacom Fails on Service Delivery and Client Communication

I cancelled a Vodacom LTE contract on the 8th June 2026 as there was 2 weeks of no internet service and the next 2 weeks limited service. No communication from Vodacom as to when the service would be fully functional. I handed in a letter of cancellation at Vodacom Whale Coast Mall on 8 June 2026. I was fully paid up at the time. Since then they still keep trying to debit me with the premium - when will this end?