Club Mahindra Holidays — Misbehavior and challenging to not refund money

As I had complaint against uninformed charges and wrong details about packages and want refund of my money on 31st May for my member id- 3008331.
I have received 2 calls from their executive. In first call, he has just listened all the details and asked to come back with proper solution. but, there's no such update.
After 20 days, I have received another call by one of their executive threatening, " we'll not refund your money at any cost". Also, asking; "you have not signed on club mahindra paper that this facility will be given". so, you can't claim anything.
I was complete shocked, like; is this the way they use to treat or behave with clients?. It means, they're Fraud and Cheaters.

kindly do something and help with refund. I have no such money to loose.

Regards/-
Vikash Kumar
Member ID- 3008331