Birla Institute Of Technology — Not giving response regarding my bits hd application form

I have applied for BITS HD exam on 25/04/2023 for Computer Science courses and I paid an amount of 3400/-. I am from Electronics and Communication Branch. On 27/04/2023 they put a notice on their website instead of sending a mail personally that non CS/IT branch students are not eligible for Computer Science courses. This information should be known before submitting the application form. Now, they are not even responding to my mails neither they are picking up their toll-free. 3400/- is not a nominal fee hence they should refund it and this information should be shared beforehand. This is a fraud as they are not even sending us a mail regarding such information.