For such post where the beginning the employee is kept on contract basis, such university or organization has their own set of rules and regulations or the act of the university from which the college is affiliated to.
There are many judgements favouring you but the actually contract basis in those cases had a longer time period and selection by university is done by the Act which it follows.
You should write a letter to the high officials narrating your problem and then go for legal notice
As going against them will make ur bad face to the college