SASTRA University — Regarding fee refund

I am Moulya K. I have admitted to the branch Aerospace engineering during the admission process and paid 92, 000 to get enrolled.Later got Electronics and Communication Engineering (Cyber physical systems) during the sliding process of admissions 2021 in Sastra University.
Later on, I had withdrawn my seat within the given time of seat withdrawal(1st week of December), even I had sent mail but there is no reply..
Application number: BTMTI2115361
Please resolve the issue and I look forward to receive a prompt refund.

With regards
Moulya