Rain Billing Department ignoring several client call back requests

I have a wifi plan with Rain which I pay R649 per month for. 2 months in a row they try to debit me R1202, in July I queried this with them and D within a day it was fixed and I paid my R649. They explained to me the additional amount was for a cancelled subscription I had with them back in 2021 and they assured me it had been removed. Again when I check my Rain One app before my pay day on the 25th, I see I owe R1202. I tried to call Rain for 2 days straight and each time they say they can see the issue someone from their Billing Department will call this happened until they turned off my wifi on the 26th, we had zero wifi, mind you I owe from home on certain days. I went on Rain One app again to log a query and it asked me to make an arrangement to get my services turned back on little did I know this arrangement was on the R1202 not the R649 and I have been trying requesting a call from their Billing Department since then, today is the 9th of September, the wifi is unstable. I cannot pay for R1202 when my monthly bill is R649, this is affecting my ability to do my job and I need this rectified ASAP. THEIR BILLING DEPARTMENT DOES NOT COME BACK TO CLIENTS! IT'S SOOOOO FRUSTRATING! I would not recommend Rain.