Buying out contracts,making upgrading impossible

Phoned call centre to upgrade. Nightmare in it self! Told them Vodacom had a better deal. They ask for a chance to match. No response when promised. 2 hours on phone later I actually speak to a supervisor. Half an hour later he phones. With a great deal. I confirm it is the same package. Do all and am happy. Then I get a call. So sorry... not the same package. I was on a top up. For a reason. My daughter uses this line... now I am told sorry it is an open contract. I can just limit the available amount. NO SIR. I can't. Because then we can't top up!!! You made a deal. Honour it. Oh. Again I was promised a call back... by 11 today. No need to say... did not happen. And all you did was insure that I now miss the Vodacom deal. How about some accountability?????