Double debited me and no feedback no refund

I have been debited double the agreed amount, 31 December 2023. I have been calling cell c everyday for my refund. The social Media team has contacted me however they say yes I will be refunded and they keep saying someone will call me Cell c has acknowledged the mistake, but no one is calling me I keep calling in and they just keep saying that its still under investigation. Two different stories. Just imagine they take peoples money what happens if this was grocery money to feed kids. The service is so bad I honestly am so disappointed. I have been a loyal cell c customer for over 13 years. Since I took a contract I have never missed or made late payments. This is how companies loose loyal customers. They ignore them they treat them like this and give all their attention to the ones that will give them a run around for their money.