No service

I have a contract with Vodacom, 1G per month, first I did not have a cap on my wifi, but after a very high bill a few months ago, I went to the vodashop in the Mall@carnival and they put a cap on my Wifi of R50, so if my gig is finished I can only use another R50 or so I thought, we are busy planning a holiday to Namibie and we need to go on the internet for accommodation. I was busy on the Internet on the Friday night and the Saturday night I wanted to use my internet and saw I could not log in. I phoned the Vodacom help line and they told me they are going to open the account, load another R20 to my cap and then they will load a once of 1G for R79 and I should wait for about an hour then I should try logging in again, nothing happened and the Sunday afternoon i went back to the Vodashop to ask them for help, only then I was told my bill is over R800 and they explained to me, if I am busy on the internet and my cap is reached it will not kick me out. Nobody told me this, they also logged a call on my behalf, because I still could not use the once of 1G and my acc was still locked. I tried again last weekend and still nothing and nothing was done re my call, No service from Vodacom