Christ University — Amount got deducted from my account and application coming incomplete and not got the refund.

On 21st of may I filled the application form for the exam which was held on 29th may. I paid the amount 1500/- in that form and I didn't get any application number Nor any mail regarding this. Due to this I wasn't able to appear for the exam and I missed my exam. I was told by the university that I'll get my refund within 15 days. And now it's july. It's been two months I didn't get my refund back. Kindly check that . I want my refund of 1500/- Rs back.