What was the notice period as per the Rent Agreement - Do not worry if you do not have the one signed by the land land lord.
you have a partial executed agreement basis which you have been paying rent and also the security deposite. if the notice period
is one month, write to the land lord cc to service provider that he should duly serve the notice on you supported with one counter part of the agreement duly signed by him. even if refuses you can say by ... date the premises will be ready for hand over and the keys will be handed over only against receipt of the security deposit refund and any other dues