Wishing i didnt accept the offer

I want to cancel two of my TFG accounts after what happened with this one2one department, I app**** for a sim contract from the of which they called me and convinced me to apply for ,then upon delivery around October 2015 the sim was inactive ,then I had to spend a month and a half calling them the fix the matter but I did not win ,decided to put the sim away, then I called them late December 2015 to cancel the contract since I forgot where I placed the sim ,that's the only time they decided to tell me the sim is active and I still have to pay for the whole two months of which the sim was inactive at the time .I AM still sending them emails but there is no replies .