Revision of standard rent in MadhyaPradesh where tenant is MP state goverment agency

My house is rented to MP state government agency. It was rented long back in 1970s. In 1996, the rented area was reduced and its basic standard rent was fixed at Rs 5000. The rent is being increased every 3 year by 15% of the basic standard rent fixed in 1996 which is Rs 750. It is around 24 years now. Last year, I filed a request in rent control officr of colloectorate for revising the standard rate. However they gave decision to increase it by 15% but did not revise the basic standard rent itself as per current times. they say that standard rent can be fixed only once which is already done. Market rates are higher. My question is: 1) Since I am requesting the revision of standard rent after 24 years, does law not allow re-fixation of standard rent itself after such a long period of time? If it allows, can you pl suggest the right act/clause for it. 2) the increase should be always be 15% increase of 5000 Rs basic or should it be 15% of the previous rent? e.g after first 3 years, the rent became Rs 5750, should the next increase be 15% of 5000 or 15% of 5750? Pl suggest right act/clause for its interpretation.