Cancellation Nightmare

I gave notice to cancel my subscription with Bitco on 28 Feb and was only contacted by Bitco 3 days later on 3 March. When asked to send confirmation that my subscription has ended I am informed that I have to pay up until 31 April as I only gave notice on 3 March. This is inaccurate and completely unacceptable. Why should pay an entire month extra subscription because Bitco is *********** and takes 3 days to respond. Bad service. On raising my concerns I was told a manager would be in contact with me to resolve the issue, no one has contacted me. I have sent follow-up emails as well, and no response.