Vodacom billing ****

My contract for data expired at the end of September 2025. I called Vodacom in November to cancel the contract and requested to be moved to prepaid. However, they continued to bill me in December and January even though they did not allocate me any data and had confirmed by email that my contract was cancellation. So, Vodacom billed me two extra months without any service. Their call centre cannot assist me and their shop refer me to the call centre. What poor service from Vodacom. They will never see a penny from me, ever..