Termination of contract

I have a month to month contract with Rain since some early last year . All had been going well until the connection started giving me problems . Due to that I decided to terminate this contract so I communicated with Rain sometime in march to make arrangements that they disconnect the router and all necessary means that should be done. They responded with attempting to make arrangements to come fetch the router sometime late march . However that never happened so they still billed me for the following month . I called again , not once and the consultants kept making more empty promises saying they will escalate the matter which they didn't do . Till today I wait and I'm fed up with such poor service .