Limitation period for suits on immovable property is 12 years. However the limitation period will take into consideration the date of filing of such suit and not the date of service of summons.
if you have any doubt on the sincerity of your lawyer you may seek a change from him and approach a different lawyer. Since your suit is still new there will not be a problem in changing your advocate on record. However if your suit reaches the arguments stage then changing would be far more difficult and risky.
Also please be sure about the allegations on a lawyer but in case you are certain of your apprehensions, you can always complaint against such advocate to the State Bar Council.