Contract cancellation

I have been trying to cancel my month to month contract for years now at no success. I would visit a branch, stand in a very slow moving queue only to be told I can’t cancel without my ID(at that time I had lost my ID). I then returned when I had my ID and I was informed that they were offline. Finally I gave up. A year or two later I call their client care and I’m informed I can’t cancel their contract via client care. Today I called again and I was directed to their online site to cancel. I registered a profile but much to my frustration there is no account linked to my profile! During all this time none of their agents were friendly or even sounded the least interested in helping me.