Tenant created fake rent agreement which is fraudulently notarised

Hi Team, I have a property in chawl which i have given sub rented to a Tenant Mr Ram Singh. over the end of agreement when i told him to vacate the property he refused .. We took a degree over him in court saying area of shop is 220 sq feet in which he cooperated. Post 6 months when we went ahead and filled a suit for execution of degree he created stated in court that the property has 3 owners me & my two cousin brothers . the tenant has made fake rent agreeement back dated & notariezed the same.. I am sure the rent agreement he has created through notarised is fake how can i prove this in court . I want to file a different suit on the tenant for fraud and 420 but how to i authenticate the rent agreement he has created.