Cellphone Contract Billing Nightmare

I took out 2 Telkom Mobile contracts last year. For both contracts that I signed I have supp**** my banking details for a debit order. But telkom never took off a debit order off my account at the end of the month. So I had to logon to their website to pay my account via credit card. So I ended up being behind on my account. Telkom then locked my accounts. Then all of a sudden Telkom took the full amount owed via a debit order from my account. Which was fine with me. I then phoned them and asked them to unlock my account as they did take off the debit order from my account for the outstanding amount. I was told on the phone that my account will be unlocked within 24 hours. My accounts was still not unlocked, so I went to one of the Telkom shops to get this sorted, just to find out that Telkom has just cancelled my contracts. Then I received a bill for the handheld devices of R12000 and they just took the money off my account via debit order. I have not requested my account to be cancelled but to be unblocked. I do not have R12000 once off to pay for these handheld devices. So I have reversed the debit order. Now Telkom just take off debit orders off my account for different amounts anytime during the month. I thought they were better than the other cellphone companies just to find out they are worse when it comes to after sales service. I struggle to get hold off them to get this sorted as you hold on the line forever.