Cellphone Contract with Vodacom

I'd like to thank Helopeter for helping me with my Vodacom contract where they took it back to the normal agreement. But now I have a new problem with Vodacom where they say I didn't pay them while during May I paid my account at Sandton with cash because I had no money on my account then I decided to pay it cash at Vodacom that was before the deduction date. Right now it appears as if I didn't pay them at all. Saying that just because my account bounced when they were deducting. When I try to call them and explain myself they fail to help me and now they switched off my number and their network. To my side I'd like Vodacom to take back their cellphones and cancel the contract. Here are my contact details ***