I have gathered contact information for the Happy Teen Patti app customer care from within the app and given the details on this page.
Email Address: getiasfun@gmail.com, happyplay008@gmail.com
Telegram: +91 8147329586
Happy Teen Patti Telegram Group Link: https://t.me/happyteenpattichat
They also have a youtube channel, and Instagram account along with Telegram and Whatsapp channels. You can join them to stay connected for updates