Roof rights and roof access rights in Delhi (Rohini)

I have bought a flat with roof rights in Rohini Sector 20 in 2014. 2nd floor people have right to access the roof in reasonable hours for their water tank and dish TV maintenance. I do not stay there and 2nd floor owner is asking me to give roof key to them. I have given roof key but they damaged it and not accepting it also not repairing it. Have given key in neighbor but 2nd floor owner asked key at 5am in the morning so neighbor denied to keep it. Now 2nd floor owner is saying they want roof open whenever they have water related problem even unreasonable hours. I am saying I will not give you key and when you will have water related problem then you have to give me some time to provide you key. I am working and even if live there I won't be available 24*7 for their emergency water related problem. What you suggest on this. whats my rights in this situation and what would you suggest to 2nd floor owner. Please reply