Rain *****s my money 2months now

Ive been using rain 4g for 2years now then June I decided to upgrade to 5g I paid R499 immediately then I asked them what will happen to the other Sim card as I don't need it and the lady told me it would be canceled. I threw the Sim away cos I didn't need it and I was not going to pay to 2sims. July my account was debited R749 by rain when I asked they said the other Sim was not canceled I asked how cos I was tod it was gona be canceled plus it was not being used cos it was destroyed they said the matter would be sorted out and that the next month they will credit R250 to my rain account and debit me the difference which will be R249. 25th August I got debited R749 again when I called they said it was an error as the other card was canceled and I asked them to send my R500 back they said they will but didn't I called again the following day asking for the manager they refused and was told me someone from their finance department will call me till today it's the 20 of September today. Rain has inconvenienced me I had to miss a payment on 1 of my account because rain has my money. I need this money from rain. I didn't know they are such ****** taking peoples money like that. I'm not happy at all