1. You should have got the leave and license agreement drafted by a lawyer. If the leave and license agreement is not properly executed the protection of rent control laws is not available.
2. What does the agreement say with respect to the renewal thereof?
3. If the agreement was executed between your mother and the tenant then your mother alone should have signed the rent bills/receipts. It may be difficult for you to explain in the court that this man is your tenant. Be that as it may, the only legal remedy available to you is to file a suit for the eviction of your tenant in the court.
4. Show the agreement to a lawyer and see if anything can be worked in your favour.