Unauthorized upgrades & Debit Orders

I am a very dissatisfied customer. I took out a contract with vodacom 2yrs ago March 2021. In January a consultant from vodacom called me to upgrade, I told him I do not want an upgrade as I'm waiting on the contract to cancel as I need to free up funds. Without my consent this guy went ahead and upgraded my package. In February when the debit went off I only realized that he upgraded me. Since then I've been struggling to get this reversed and sorted out and my money reimbursed as I never chose to have an upgrade. Bear in mind I was the one calling, following up and being inconvenienced all the time. They eventually assisted me to have my numbers converted to prepaid as of 1st June. Just to see another debit go off this month again but I am no longer on contract. I have had it with vodacom and their pathetic services. I send in a complaint via email to *** on the 24th May regarding this horrible nightmare and up until today 22nd June not one person emailed back or even called me. I am very close to going to the ombudsman with them as they are taking money from customers. And the amounts they take is not due to them. I am anxious and I want someone with sense to call me and sort out this nonsense.