Virgin Active is not cancelling memberships!!

I've cancelled my membership in July, got a reduced charge at the end of July and then a refund in August. Suddenly now in September, I am being billed again only to find out that my membership is still active!!

I phoned the cancellations 4 times today. Every time I explain my story, they either transfer me to the accounts department where the call gets dropped or they just end the call!! I need this resolved ASAP!!