Stuck since last 13 years after booking flat

This is regarding flats booked 13 years ago with verbal assurance of possession by builder in 2 or 3 years,was given allotment letter and payment made by cheque,builder is buying time since then making excuses,after booking the flat builder got into litigation with the old tenants for fraudulent forging documents but the case got dismissed and FIR squashed against him,the plot is still occupied by the tenants nothing is done,later in compensation he offered another under construction site of his which is far away from where the booking was done but can't trust him now,since last 13 years living on rental,later after pleading him that now cant afford to pay high rent the builder agreed to contribute sum amount for rent since last 4 years,but neva pay on time he's paying as per his convenience as if he's doing a favour, if insist him for final settlement he says even my partners are involved you will need to talk with them aswel which I agree,but they are never in office at the same time