Cancelled contract within 2-weeks, now handed over to MBD creditors for owing Vodacom, who have yet to resolve anything

In December 2022, I received a cold call from a 3rd party for a Vodacome wifi contract. I was told the router was battery-operated - something I wanted to use during loadshedding. On receipt of the router, I realised it was not battery operated. So well within the 2-week cooling off period, I called Vodacom, cancelled the contract, and the router was collected - I had been charged for the remainder of the month, which was never reversed. Then, in February, I got a debit order from Vodacom. I emailed Vodacom to ask them to stop debiting me. I thought this had been sorted, but another debit order went off my account in March. I then called Vodacom and spoke to someone who said my contract had not been cancelled on the system. It was then apparently cancelled. I never received another debit order. I tried to recoup the R650 Vodacom owed me from their ******* debit orders. Still, after speaking to someone at Vodacom (who battled even to find me in the system as my contract was no longer active), the run-around did not seem worth it as I had to contact the third party to attempt a refund. I decided to cut my losses. Then, in December 2023, I received a call from MBD to say my case had been transferred to them as I owed Vodacom around R8000 for a contract I stopped paying for in March. I was under investigation. I calmly explained my case to the woman and emailed everything in detail. A month later, I received a call about the same issue and had to explain everything again. They didn't receive my email. I sent it again. A few weeks later, I received another call saying they had not received my email - They don't have another email to which I can send it. Today, I got another call from another random call centre agent, but the line was cut off, and they never called me back. I have spent hours on the phone retelling my story, writing emails to no avail - when, in fact, my contract was CANCELLED IN DECEMBER 2022, and Vodacom owes me r650!!!!! I am appalled at Vodacom and MBD who clearly are not doing their job AT ALL. I am quite certain it is very simple to pull up phone conversations where I had to cancel the contract for a second time, and surely there is no activity on the router/sim, which I never activated or used. Shocking!