FNB Connect Response

I ordered an FNB Connect SIM card on contract for R95 per month. However when I got my first bill it was R757.18, no one informed me that they do not cut off the data once you have used the 2gig, anyway now I want to cancel this contract as it costs more than the agreed amount of R95 per month. They also charged me a service fee of R50 and instead of R95 for the month, I was charged R161.11. I cannot afford these hidden costs that were never mentioned and I feel as if I was ********** by FNB Connect. I sent an email to connecthelp 6 days ago and no one has contacted me to assist me. I would like to cancel this contract, can someone contact me with the process I can follow.