REVERSE DEBIT ORDER

I took up a contract 2 years back, my last debit order was December 2021. I had called well in advance to cancel as requested, but January 2022 the debit order went off. I have been trying to get hold of them but their customer service is so horrible that i couldn't get through. I called by bank to reverse the debit order, which they did. February another debit order goes off, this time they double charge me including a fine fee which made no sense. My husband finally gets through to them and they promise i will get a call within 3-7 working days to rectify the issue and refund my money with Reference number ***. Needless to say, i am still waiting for that call and i have been trying call their lines and even go to vodacom stores for help to no avail. This is SOOOOOOOOO disappointing and FRUSTRATING for such a big company. I just want my money back.