Really poor service

I have cancelled my gym membership in March 2014, and still the debit order is going every month.<br> Recently called the customer care line(again), when I was told they can see on the system I have cancelled long time ago, and that the debit order will be stopped and the money back paid into my account. And this never happens.<br> <br> I do not know what else to do to stop this membership and debit order.