UNBELIEVABLE!!! Vodacom RED VIP+ - NOT SO VIP

I pay a high premium every month for a Vodacom RED VIP + package to ensure that I have non-stop connectivity. At the beginning of April, Vodacom debited my account with the incorrect amount and a few days later my account was blocked due to lack of payment. I went onto MyVodacom and had a look at my account balances, saw the issue, and paid the outstading balance in full. If fact I over paid to ensure that there were no further issues with my account. My account was then unblocked. A few days later, my account was blocked again. I then significantly overpaid my account to ensure that there were no account issues. However, since then, my account has been blocked regularly due to my 'credit limit being reached'!? I have to phone each time for my account to be unblocked, only for it to be blocked again a few hours later. I have phoned so regularly that Vodacom are not answering my calls. I PAY A PREMIUM FOR CONNECTIVITY, YET MORE OFTEN THAN NOT I AM DISCONNECTED. I AM FED UP AND SICK AND TIRED OF WAITING. I USE MY PHONE FOR BUSINESS AND IT IS EMBARRASSING NOT BEING ABLE TO MAKE OR RETURN PHONE CALLS.