Activation of my phone

My phone was suspended, we agreed that I must pay 2000 and then after 48 hours they will unlock my phone then I will pay the remaining amount at the end of September, but I had a very strong conversation with the consultant they decided not to unlock my phone, they said I must first pay all the money am owing to them, now I cant make any outgoing calls, that's the worst service I have ever received from vodacom, they are so arrogant I cant wait for my contract to expire with them, i will never ever take a vodacom contract never!!!!