Sent from pillar to post to cancel my contract - no coverage!!!!

I have been waiting two years to cancel my contract due to non-coverage and to move to PAYE, KEEPING my number. I have visited the store several times and was told I didn't need to give notice to cancel at the end of the two-year term. I was told to come in on the 13th, two days after my contract ended to allow the bill date to run. Today, the 12th, I called Customer service and was told my only option is to run the contract for another month with cancellation on 11 December. I went back to the store where I got the wrong information and was told that the customer service lady gave me the wrong information. We called retentions again at the store, and I was told I must call coverage to get a letter about non-coverage. I got a pathetic response saying I'm on a month-to-month. I am still waiting for the contract to be cancelled and now may lose my number. How can I keep being given such bad information?