Vodacom Continues To Bill Me Even Though Contract Has Ended Almost 3 Months Prior

I have been a contract customer with Vodacom for almost 18 years. On 30 October 2023 I put in my notice, telephonically through their cancellations department for my current contract which would end on 30 November 2023, to be cancelled. On 1 December I was billed yet again. I called Vodacom, they explained the person did not do the cancellation on their past. I lost it with them, explaining that is not my problem that their people cannot do their job and now I, the customer have to suffer yet another bill payment on a CONTRACT THAT HAS ENDED. The person on the call then put in a note to have that bill refunded, which to date it has not been and I have been subsequently billed yet again, on 1 Jan. So now it is about R1000 that Vodacom has taken from me on a contract that has ended. I called in December again - 21 December to be exact - to make sure I am not being billed in January and that they are returning my money - guess what, as mentioned above I was billed and none of the money has been reimbursed to date and I cannot get hold of anyone with enough common sense to get this sorted out once and for all. At the time the person on call gave me the Billing Dept number - nobody answered for close to 30 minutes. To date I still cannot get through to anybody there but you continue to take my money, *******ly. It is disgusting that for any accountability one has to reach to social media to try get an inch of response from this company, if any at all. I want my money back, I did all measures your people put in place - this is your issue and I want it rectified. I am done asking nicely.