Not getting DA on new Job after VRS. (Re Employed pensioner)

I took VRS from post of Associate professor after 24 years of work. I was getting my pension and got re-employed on the post of an Assistant professor which was lower than my previous designation. The clerk in new college was expecting some amount from me to do the official work of joining. I have been an honest person in entire life and didn’t support corruption. In revenge he said I will not get DA on my new salary because I’m getting Dearness relief in my pension. I was getting my salary on 6000 Grade. 22500₹ was my salary without HRA, DA and other things. After few months we tried to get in touch with Director of education Uttarakhand. It was a long process which took couple of years in letter exchange. Finally director of education scolded the college Administration and Told them to make a bill of DA of 5 years. Later on I got another job as Associate professor. Now when I tried to get my due amount from college. They said education department of Haridwar district rejected it. When we went to the clerks they said we have to do enquiry if you’ll get the payment or not. We showed them the letter of director which clearly stated I should get the DA amount. Please help me . What should I do.