Lines blocked thanks to a TELKOM mobile error - No joy whatsoever!!!

On the 24 April we went to process an upgrade. We were told the Telkom store at Mall of the South was offline and they had no stock of the device. They referred us to the iPhone store at the Glen. It took two weeks to finalise the upgrade and we were able to collect the new device on the 2nd May. An sms stating we have reached our credit limit was received and shortly thereafter another sms stating our lines would be blocked. After investigating, the iPhone store who was really great, confirmed that Telkom had processed our upgrade incorrectly and billed us R19000 as a device obligation fee. This over and above almost R1000 per month for 24 months. I have now called 3 or 4 times to get this resolved as our mobile devices are blocked. Each time i call the contact centre, there seems to be no record of my previous calls and now get told the turn around time is about 72 hours for them to open my lines and rectify the upgrade. So through their error or incompetence, I am the one who is now inconvenienced and am still sitting with an invoice of over R21000.Totally unacceptable.