Request to cancel contract with no response

I joined Gym company on 11 November 2015 but due to unforeseen circumstances we moved further away in December 2015 i sent them two requests in December to Cancel my contract on web site (during my 30 days cooling off period) as there isn't a gym company near me and to date absolutely no response!! so i stopped debit order on my account and have not paid them thinking this will get them to call me still nothing!! <br> <br> <br> PLEASE CANCEL MY MEMBERSHIP I DON'T WANT IT!!!