Cancel my expired contract impossible

Hi<br> <br> I have been trying from before April 2015 to cancel my data contract - Contract termination date 2015-04-09.<br> <br> When I phoned in March to advise I want to cancel the contract they said it was not necessary.<br> <br> I have now requested several times on email to cancel the contract seeing the customer care number does not ever get answered when phoning the call center now, only after the 3rd email and 2 more months of being charged they sent me a form to fill in this should have been sent to me after the first email request. <br> <br> After sending all the forms etc. I have also now asked several times to confirm the cancellation seeing I was charged again this month and I have now paid for 3 month extra since my contract termination date.<br> <br> I need a refund for 3 months and I need a confirmation that it was cancelled which no one can give me.<br> <br> Who can I contract to get a response and a confirmation of cancellation and refund.<br> <br> Regards Sandra