A civil suit can be filed before the court of District Munsif and it can be a representative suit on behalf of similarly placed persons. Public interest litigation (PIL) can be filed only in the High Court by way of a writ petition which is a constitutional remedy. No one can give you a guarantee regarding the time limit for its disposal. In either of the litigation, the court fee has been fixed. However, the lawyers’ fee will be several times more than the court fee.