surprise cancellation fee R999

I activated my afrihost fiber line on 02 july 2026 and I was having issues with my bank account my fiber line was cancelled on 22 august 2026 my bill was R355 per month and yesterday I queried my bill to make payment and the bill reflects R1379 with a cancellation fee of R999 which I was never told about neither was a contract signed to stipulate the cancellation fee I require for my line to be reconnected but I am not prepared to pay the cancellation fee