Vodacom bad service

Good day Vodacom, After numerous sms, phone calls and 3 times at Vodacom Kolonade for an upgrade still no one can assist me. They keeps saying I must come back next month. First of I was told I have a bad rating at Vodacom????? Now one can tell me why! Paying R 1900 a month and paying my account the 25th off the month???? 5 Months back I received a call center phone call stated I owned Vodacom money. I immediately call Vodacom to find out whats going on and was told there is money outstanding from last year June 2017. Never was I, nor my wife informed about this for a year. The account was immediately brought up to date and if Vodacom wants to keep me liable for there mistake its fine. Today 07/10/2018 I went back to Vodacom Kolonade and was told again my rating is bad and she could still not tell me why. She went to the manager and was informed I must go to much lower contract and then I will by able to upgrade??? Still no upgrade done today although we went to a smaller contract. I did myself a favour and went to Cell-C with the best service I received in a long time and I was speechless. I'm paying over a R 1000 just for a nice phone and 800 min talk time and 1 GB data?? Cell-C is offering me also a nice phone 900 min to any network and 1 GB data all for R 700. Vodacom please check my number on u'r side I know there was a bad patch a while back but, and I did sort my account out immediately. I'm a long customer of Vodacom and certainly aren't treated like one. I hope we get this mater solved or I will cancel my contract and my wife's contract I will take this mater further. Also check on u'r side all the messages and times Vodacom lock in to my account the last 3 month!!