Cancellation of expired contract.

Been trying to get my expired data contract cancelled for the passed three months. I filled in a cancellation case a month before the contract expired and was told that someone from retention dept will phone. Still waiting and that call even though I've called in and explained numerous times I do not wish to keep the contract. Been paying for the contract for the passed 3 months and am not using it (do not even have the simcard any more). Service are horrible and with this going on I think its best to cancel my other contract as well. Time to move to a different network.