Ansal API — Forgery by Ansal API in Sushant city Meerut sector 4A

My family purchased a plot in Sushant city Meerut sector 4A in 2010 in resale. Transfer was made in the name of my mother. As registry wasn't opened at that time. Now after waiting for more a decade for registry we came to know last month that plot was not there in MDA approved MAP. There are around 10 plots missing in approved plan. Means Ansal sold 10 plots in sector 4A Meerut without acquiring land. Now the management there is not giving any prompt response. I came to know that in case if i lodge a compliant in UPRERA and got response in favour o[censored]s than to there is no execution o[censored]PRERA order from ansal end. Please advise me what I need to do in this case. Do I file a case in RERA or look for consumer forum.