Bad service when canceling subscription

Had a bad experience when canceling subscription. Had to constantly follow up from my side, then only would I get a response. They requested documents in drips and drabs, for the cancellation. We were not refunded the full credit on the account and have still not received a response to this query. I am still currently awaiting confirmation that all billing has been stopped and that the device insurance has been cancelled, as we do not want to have a bill down the line. It is difficult to just get the confirmation. Really poor service!!!!