Error on my account, call centre attitude bad!!!!

my contract ended at the end of September, I was contacted to renew my contract and agreed on R139 contract deal to be debited on 25th of October. On 21st of October I received an SMS telling me that u would be debited R805. I called in to enquire and was told that I have an additional R600 internet add-on, I advised that I didn't ask for it and want it cancelled immediately. Salinda opened a case no. ***4 and said it would take 9 days to cancel. I advised that I did not want to be debited on the 25th for something I did not request nor agree to, she put me on hold for 30mins then hung up the phone!! Terrible service!! I want answers as to my account status and assurance that I will not be debited!!