Club Mahindra Holidays — not sending membership cancellation

I have sent enough of cancellation mails and had gone physically to the office and they replied me saying you will get cancellation mail within 2 days. I work in dubai so i had to go back. But in the mail also they didnt reply. Now its been 2 years and you guys are blackmailing me,... I didnt get any response for my any of my mails. Sales persons have been texting and torturing me with emi payment and stuff...