Still beign billed

How many complaints and reference numbers will it take for you to stop billing me for a computer i dont have. The shop didnt give me the modem with the pc i wanted. The consultant told me the deal will be cancelled. From November i am beign billed for something i dont have. I would urge anybody to thi k twice before taking out a contract with telkom. The people in the shop is lazy to work and there is always a endless que with peope with problems