MTN refuse to cancel contract after ending time.

Called two months ago - you told me to call closer to my end of contract time. Called a month ago - you told me to call the day after my contract ends, new rules. Called a day after my contract ends - you refuse to assist me, keep putting me through to this person then that person. I am calling for a second time today, and for the second time I am on hold for longer than 30minutes. I am currently on hold for 39minutes. It is clear that you make it impossible for me to end my contract (after I told you more than 3 times I wanted it to end)...what's unclear is how legal is this?