Overcharge on Data

I have been using my IPhone 5S for work and got retrenched end of August meaning my email, usage have been less then when I was working.<br> I am on a contract with 5gig data and it's always been enough, but since October my Data usage have increased to more than double so I log a call with Vodacom ON 27 October to investigate and no one got back to me. So once again client service up to **** and I begin the client have started buying more data bundles to the amount of between R500 - R1000 monthly since. I haven't done anything different data wise than the last year except for my email usage becoming less since being unemployed.<br> My latest bill I received today date 3 December comes to an amount of R8200, bearing in mind I also bought a 10Gig data, 5 Gig Data and 2Gig data on top of my monthly 5Gig I get on my contract.<br> I have now logged another call as I refuse to pay the R8200, I will take this to the news papers and cancel my contracts with Vodacom if this is not resolved ASAP!!!!