Can't cancel a contract

I received a tablet on the 29th of February 2016, which I would like to cancel and apply for a different one.I tried since Tuesday (1st of March 2016) to cancel the contract, which apparently no one can help me with except if I phone ***. I phoned that number 6 times everyday since Tuesday and there is \no agent\" at the call center to assist me. I phoned the normal call center and no one can assist me either. Today is my last day to cancel otherwise I will be charged a cancellation fee and I need to pay the 12months. It's ridiculous, I will go get a tablet from someone else and will definitely change my service provider to someone that wants me as a client and not only the money. "