As per the registration act, if the lease agreement is not registered than owner is in fault and guilty. So politely you should mention them to register the lease agreement other wise vacate the premises as early as possible as there is no lease agreement.
17. Documents of which registration is compulsory.—(l) The following documents shall be registered, if the property to which they relate is situate in a district in which, and if they have been executed on or after the date on which, Act No. XVI of 1864, or the Indian Registration Act, 1866, or the Indian Registration Act, 1871, or the Indian Registration Act, 1877, or this Act came or comes into force, namely:—
(d) leases of immovable property from year to year, or for any term exceeding one year, or reserving a yearly rent;
Nothing confused answer. Its clearly mentioned that Law and section of Registration.
What law says.... that I have shown you mirror and not registering lease deed .... no doubt how innocent owner is ........at last owner is booked for culprit for not registering lease deed.
There are only two options remaining in front of make new lease deed and registered it for current period on wards for example 11 months take toady date as a start date.
or ask them to vacate the premises without ant legal issue.
If you go for legally to fight with them than you have to face the consequences.