cancellation of sale deed time limit in a civil suit

I have sold a plot in the year 2013. They have not paid money at the time of registration instead they promised me to give an apartment instead of plot. The mediators has written an agreement on behalf of builder in the year 2013 at the time of registration. The persons who purchased the land from me did not respond but the mediator`s son told me that they would pay sale consideration and written the same on 100 rupee stamp paper in the year 2018. I have filed a civil suit for the cancellation of sale deed. I am worried that it is beyond limitation for cancellation of sale deed. Can I file a seperate suit for recovery of money or I should continue the same civil suit for the cncellation of sale deed. and also tell me time limit for cancellation of sale deed?