Vodacom bad service

wow, we have been with vodacom +/- 10 years, after cancelling a few contracts that have run their course and cutting down on costs we get an account of R8000 for goodness knows what. 1. does not seem that contracts were actually cancelled 2. my top up contract that was taken out on R500 we are being charged over R700, why? what are the extra costs for? I have no idea what on earth is going on with their accounts department, they are taking their sweet time sorting out the account meanwhile we are all soft locked and we need our phones for business but we are now stuck waiting on them and in all honesty they just don't care, I personally think the time to move to another service provider has come, and the absolute BEST of all is that we have been charged full contract charge for the past 14 months for an upgrade that they created a new contract for and we returned and informed them we did not require a new contract or phone