Airtime cancelation

My name is Margaret I have an account at Miladys which I paid fully the problem is now they joined me where the had to load airtime for which I told them I do not want because I buy myself airtime . I told them.i do not want it they said I must first pay re cancelation fee which I did and they didn't not cancel they went to far last year that they blocked my number for 3 weeks . I tried for weeks to open it after sometime they unblock my Sim card. I tried to call them so that they cancel this but they haven't done it till now it's almost a year pay for airtime that I do not want. When I try to enquire why can't they cancel the deal they I cannot be done from the store they have to wait for the head office to do that. Please help me I'm tired of this.