***** - deducting money without customer authority

After a 4 month premotional item expired they billed me for the next month and never even credited my account with the data i was billed for. I was not told that i had to cancel the premotional item or i will be billed for it and i never gave authority for them to detucr more then my monthly instalment. Afyer numorous calls i have to wait 48 hours for feedback and then possibly 7 workinf days for my money. This is *****. You cannot deduct money without me signing for it. And then then worst not even credir my account with what you billed me for. More than R1000.00 deducted without my authority.