No service No solution

I got a call last year November from Yellow mobile. They offered a contract with a phone. During this conversation the line was dropped numerous of times. The conversation led to a argument where I already requested to cancel this contract to be, and was claimed it is loaded already and can not be done. So I thought give them another chance as my number was already ported to another service provider and stated to the consultant that this was the case with this number they are calling on. So we carried on and came to the point where we were had supply banking details. We proceeded where the lady said a "verifier' will call shortley to verify my details. To my surprise it was the same person different number though. Quickly the phone was delivered. To this day the phone is working or a bill has been sent via mail or e-mail. Having ported to call customer care is now gonna cost me money. So I am using the Face book page to communicate with the company. Eventually somebody said there is a cancellation fee involved which I do understand no problem. To this day I received any amount to what the cancellation is. I am willing to pay this fee just to get this company of my mind and return this unused phone to them . I also requested a copy of this conversation of the taking of the contract no response on the request suppose legal matters involved.Now the complaint is no feed back only apologies for being busy and they will investigate and return with a solution. Nothing is done not even a phone call no response on e mails sent to both customer care and there ***** division and nothing more than sorry we will get back to you asap on Facebook . I also tried to go to a Branch but being Yellow mobile contract they are unable to assist, also could not reach their own company via the telephone lines that day. All I want is to cancel this as I am paying for something that is not working.