Lack of training to Vodacom employees

We are dealing with Vodacom for the last 14 years. The last six months my statements are incorrect - one month they billed me more than R4000 just for internet data ( which is impossible) my monthy data for the past 3 years was approx R600 monthly. They phoned me offering me a new contract for 2 devices as the contract has expired. I chose the option not to do so but go back on a top up. What happened next? I get billed for the handsets. I queried this and were promised that in 2 working days I will be contacted. In the meantime our phones were softlocked!!!! 11 days after my original query I received a call saying that I need to pay the devices as the contract has not expired they were in default. When I refused to pay they just informed me that our phones will be blocked. All phones are blocked now. I have no intention continue to pay the outstanding balance with this attitude. I am now switching to Cell C and will pay them R5 a month until the other 2 devices are paid up. I am fedup with excuses and arrogancy frim *********** personnel