Vodacom's bad service

I have a 2 contract's with vodacom and I signed for a call limit on the one in question and after 2 months I received a staggering bill because of data downloads. I went to Gateway branch and explained my problem and was told that they will log a call as it is there mistake and get back to me after 10 working days. As always no one called me and I called the call center spoke to Alga the acting manager of the call center. She explained that I needed to go to the branch as it is there mistake to fix. I went back the same day and spoke to Istihaq and to his manager Riaan that told me they will sort out the matter and unlock my lines and come back to me with the solution. Me phone went on in an hour and worked perfectly. After 3 hour my phone was blocked again and i phoned Istihaq and he assured me he will sort it out. Next day same story and Istihaq said it should go through in an hour. Its been almost 3 weeks now and nothing. So I dare the Vodacom head office to call me as i can not understand how you can let a client wait 3 months for you to fix your mistakes and say you will call and you don't. I had so much more bad things to say but i can't due to Terms and conditions. Thank