contact termination

i have been calling the MTN call center (808) since last week to try and cancel my contract. this has been the most annoying call center ever. firstly, it take me about 30 minutes waiting to speak with a consultant. once i get through, they take my details and transfer to the retention department. then i will wait for another 30 minutes, and the call disconnect or your agent claim they can't hear me. they play with the mute button to try and convince that the there is a network issue and then disconnect the phone. i work as a QA in a call center and i know call avoidence very well. call me RIGHT NOW!!! i have reached the 24th month and want to cancel as soon as possible. should i not get a call and my contract get converted to month-to-month, i will take this further.