total incompetence

It would seem that the incompetence of telkom runs through multiple departments after having issues with the installation which took 3 months telkom suddenly could not supply me the 10mb line which i payed for. So i had to downgrade to a 2 mb line to compensate them which they also could not supply but apparently was only R7 cheaper than the 10mb line which was R799 so finally i decided that i had enough and terminated the contract. So now i need a letter from telkom stating that the contract was canceled and even this is to challenging for telkom as i requested this letter 4 times now and still telkom could not supply me the letter. Please can someone give me a contact number of at least 1 competent person at telkom so i can get my letter and i can close off this horrible relationship with this horrible company