Actual area less than sale deed

Actual area of plot is 62sqm but in sale deed it is mentioned as 84 sqm. If I want to sell will there be any problem?. Do i need rectification deed for it? Can i file a case for compensation in consumer court on UP Awas Vikas Board for giving me less area. I purchased plots in 2007 2008. There was no boundary stones were present at that time. Possession letters were given in office without joint measurements.Now adjoining plots have been constructed and width seem to be reduced by 2m.