Double charged of contract

Worse service provider, I recently went into a fibre contract with them and I already have a cell phone contract with them which they have been robbing me airtime for the past 4 months, now the biggest problem it's they combined the contracts and since last month they have charged me double for the fibre, I inquire about this and they said they will sort it out they will refund me back my money or credit my account, guess what that didn't happen the same thing happened again they charged me double again and now I even have to struggle to reverse this debit order mind you they owe from last month and means they didn't fix the problem now my expenses have to be unbalanced again while they busy deducting my money, and even when the fibre goes off line they don't bother to inform me I have to buy data worse service provider I regret getting back to contract with Vodacom.