can we register a will after the death of the person?

I booked a plot from Vatika Ltd. in Project "Vatika India Next" in 2011. They asked me to take possession(Not registry) in 2016 without which I have to pay holding charges.They asked me to sign maintenance contract with "Enviro Integrated Facility Services Pvt. Ltd. (Floated by Vatika)",and I had no option but to sign the same without which I had to pay holding charges. Till date registry has not been done and without the same I can not make any construction. Now Enviro Integrated has sent me lawyers notice for maintenance charge for 3 Lakh(Approx which includes 1,44,000/- interest) plus 55,000/- for Legal notice. They have mentioned about electricity meter which is never asked to be installed or installed on site. My point is that as registry is not done I can not do any construction, and I am not availing any service so I am not entitled to pay maintenance charge. It is a nexus between Vatika and Enviro Integrated. I would like to know what are my legal options are?

I booked a plot from Vatika Ltd. in Project "Vatika India Next" in 2011. They asked me to take possession(Not registry) in 2016 without which I have to pay holding charges.They asked me to sign maintenance contract with "Enviro Integrated Facility Services Pvt. Ltd. (Floated by Vatika)",and I had no option but to sign the same without which I had to pay holding charges. Till date registry has not been done and without the same I can not make any construction. Now Enviro Integrated has sent me lawyers notice for maintenance charge for 3 Lakh(Approx which includes 1,44,000/- interest) plus 55,000/- for Legal notice. They have mentioned about electricity meter which is never asked to be installed or installed on site. My point is that as registry is not done I can not do any construction, and I am not availing any service so I am not entitled to pay maintenance charge. It is a nexus between Vatika and Enviro Integrated. I would like to know what are my legal options are?

i dont know