Pathetic service keeps repeating.

I have been a client with Vodacom since 2004, I had 3 contracts with them one expired I wasn't even notified that its going to expire and do I wish to proceed on a contract basis or move to prepaid. The next contract I am suppose to receive R 500.00 rand airtime and then billing which leaves you with the amount of R780.00 round off amount. Saturday I just checked how much airtime is on the contract with shock there was only 218 round off amount available! how is that possible because I haven't used that simcard in months. My main contract I have been receiving accounts of over 4000.00 rand I am unemployed but I do keep to my PTP dates. My line keeps being suspended I paid the amount of 5730.00 about 2 weeks ago, Today they say I still owe the amount of R2000.00 how can my account be so high when I only use my wifi, and I do make sure my mobile data is off. Whenever you try and get in contact with a supervisor they refuse to assist. I am sick of this ****. The amount so called outstanding isn't even due yet but my lines are suspended. Going to report Vodacom the service, and the lack of staff being in positions but they cant even do the job. SICK AND SICK BEYOND OF THIS ********.