I moved out of a rented apartment 15 months ago to move into my newly purchased home. When I left I cancelled all the utility bills as per normal. I asked BT for a line cancelletion form (I had broadband with them) which I filled out and sent back. Months later I noticed BT was continuing to charge me by direct debit for the line. I rang them this time and told them I no longer lived there etcc.....Undeterred, BT continued charging me line rental until four months ago when I ordered my bank to refuse the direct debit. This morning I get a call from BT Credit Control saying I owe them €90 for the last four months line rental at an address I left 15 months ago. I told them I cancelled the line in writing, they sau they never got it. I told them to check the line and they'll see it has not been used for 15 months. But like "the computer says No" routine, they insist I owe them. But if anything they owe me money. What should I do?