Unknown charges on my account.

I decided to cancel Rain after battling with intermittent internet connection issues and it was never resolved. I would like to dispute a charge on my account. I scheduled a cancellation for September 30th and the agent I spoke with advised me that there won’t be any charges for this month, however you guys have been making attempts to debit on my account. I reached out to a billing agent on WhatsApp yesterday about the issue, my balance was then updated to R890. I took a screenshot and it’s like I knew I’d have issues again. Today I logged in to check my balance again and it’s now R1790! I’m not going to pay that amount, if you guys don’t fix my balance to the R890 I know of, that outstanding amount won’t be paid off. You cannot add unknown charges on my account.