Account suspended after paying and no assistance

My account was suspended because apparently when I paid R2200 there was still R300 odd short. I called in to the accounts department and spoke to a man - he asked me when I would make the payment and I said on the 27th. He agreed and said that he would put an arrangement into the system and unsuspend my line. 3 hours later when I call the call centre because my line is still suspended they tell me this person did not enter any arrangement and did not unsuspend my account. They kept me holding for over 20 minutes and then the supervisor Nomusa comes on the line and tells me that making an arrangement with the accounts department does not guarantee an unlocking of the line - so why do I bother to call in and make the arrangement - seems that 11 years of being a customer with 5 lines at vodacom to the value of over R4000 per month means absoluteley nothing at all. I wish I could cancel my contract but of course Vodacom have a huge cancellation policy. I wont be renewing my contract though at the end of this contract and neither will the other 3 lines I have....