dispute with tenant

Dear sirs, i have let out my flat in zirakpur, punjab in 2014 @10000 per month. We have signed a 11 month lease and it was not registered. Tenant never paid rent on time but somehow we make him to pay everymonth. Now lease is expored in september, 2015 and we asked him to vacate but till now he has not vacated. He is using one excuse over the other everymonth. Please suggest how shoild i get it vacated. Thanks & Regards