Cancel contract.

I have retired from a company and am trying to cancel the cellphone contract the company paid for me. I have just been given a total run around to try to get to the correct person. There is nowhere on their website that gives me any clue as to what to do, and none of the automated answers covers this option. When busy with listening to options and selecting, I began to get calls from them interrupting what i was doing, but when I opted not to hold and to have them call me back - no response. I'm still waiting. Their contact service TObi has no instructions; it does nothing for me.