BITS Pilani — Not giving response regarding my bits hd application form

I have applied for BitsHD Computer Science programme on 25/04/23 and paid a fees of amount 3400/-. On 27/04/23 they put a notice on their website instead of sending a mail to inform us about the changes in the eligibility criteria that non CS/IT students are not allowed to take admission in Computer Science courses and since I am from Electronics and Communication Engineering, I was not eligible after that. Now, they are not even replying to my mails regarding refund and not picking up their toll-free. This is fraud as such information should be known by us beforehand. Kindly look into this matter as 3400/- is not a nominal amount.