Bad service. Lies. And no help.

Firstly, when I took the policy I was intentionally deceived or **** to about what the cover included. Upon claiming , I was told the issue I was claiming for was not covered. Now I want to cancel - I am told I cant cancel. Apparently I can only cancel at a branch after the 7th day of the intended last debit order she said to me. I do not have time to go to the branch - we entered into the cover over the phone but now I am not allowed to cancel over the phone?