Hii Sani!

If you are interested in any course and then trying to contact the UPES respective authority for admission queries, I would suggest you to register yourself to the official website first , choose a course you are interested in. They may contact you then. This problem may be due to some discrepancy with the contact desk. You may visit the following link and try contacting -

https://admissions.upes.ac.in/courses/undergraduate.aspx?utm_source=adwords_s&utm_medium=cpc&utm_campaign=Brand&gclid=Cj0KCQiAjfvwBRCkARIsAIqSWlMWgpvPqWZF17CtGQdnwDsWahvjt4KEuzOAtCOs7g_aRTkgoPnuGVsaArrJEALw_wcB

Hope this helps.

Good luck!