cancellation of contract

just briefly...ive been requesting to cancel my membership since last year when we took it out. i have contacted the lady who dealt with us but i never get a reply.on signing the agreement we were told we cannot upgrade or downgrade but can cancel at anytime. the membership of infinity is so good holiday club will buy it back as they no longer giving these membership types anymore...... I have sent a mail to the main office and received an auto reply saying they will contact me within 2 days but have received no reply, every month they deduct off my account.