Promotion and reversion

I am working in a state university (which is an autonomous body). Most of the service rules as prescribed for employees of uttarakhand govt. are applicable to university employees also. I have been promoted to Class I Officer as per rules framed by the Govt. of Uttarakhand. Now it is said that rules so framed by the Govt. has not been meant for endorsed to the University and are meant for govt. employees. While the fact is that the rules so framed were endorsed to the university since long. Later on implementation of these rules has been stopped for the time being and accordingly the university also stopped. Now govt. has again started these rules and accordingly the university also promoted some the employees. Now it is said that that these rules are not meant for the university and persons got promoted may be reverted after a lapse of three years service on higher post. Whether it is justified? Please advise.