If you have received the WHOIS contact enquiry for .MY domain name, means that MYNIC has received a request from someone through Domain Contact Request, who would like to contact you regarding your .MY domain name. MYNIC only forward the requests to you while keeping your contact information private. You as a Registrant or Domain Contacts can assess the request on your own and decide on whether to respond to the Requestor.
If you determined to respond to the Requestor, please note that you are electing to respond directly to a third party that has no association with MYNIC.
For information on Domain Contact Request, please refer here.