Bad service by Vodacom

I am due for an upgrade, but because of a system error I can't. According to the system my account is in arrears (which has been confirmed by Vodacom is not). I have been told it will be sorted out by 19 June, problem was detected and reported on morning of 12 July by a very friendly and helpful assistant in a Vodacom shop. I can't say the same for the assistants on Vodacom's call service. One was actually so rude and ended the call on me. She also said I can ens my contract if that is what I want to do. Wonderful service? I don't think so. My account has never been in arrears, so I can't see why I have to bear the brunt and be told that it was!