Cannot cancel contract

What an absolute nightmare dealing with this company. I have only had bad service from them through the years and have now decided to break all ties.. not as easy as it sounds. Their agents do not care what you want. They will talk and talk until they get what they want, or all your airtime is depleted. I am trying to cancel my last contract with them, due to the nightmare which they call client services. If I can save anyone else from this company, I must... please stay away!