Unhappy

I signed up with zone fitness just over 2 years ago.. My contract ended in May. Why is it that you people are still deducting money from my bank account? Then I go in today to go find out then I am told that they will be deducting the end of this month again. Please explain to me what give you the right to exceed your 24 month contract? I will surely make a issue about this. Because to me that is theft.