pathetic to say the least

On 2 March 2015 I requested one of my contracts be discontinued due to the 24 months being up. Yo date I am still being billed despite a total of 17 emails to them without a single response as yet.<br> I have called.them.numerous times and keep getting the same story. <br> Was then advised by an agent to only pay for the line I still want active and not for the one I requested to be deactivated. <br> <br> Please could somebody provide me with details of the relevant ombudsman as I feel this is total disregard as I'm now being sent accounts showing overdue amounts and cannot upgrade my current line either due to this outstanding payment that should not exist if mtn knew how to do their jobs.