Spice Jet Airlines — infant seat

Address:

Mumbai City, Maharashtra

I am right now on flight no sg 6249 from mumbai to mangalore date 10/08/19. I boarded from gate 49b.
How come even after paying for infant seat i am not getting any extra seat allotted to the infant..??? Please clarify on that as i am here seated with infant on my lap and who will take responsibility if something happens to him.
If your charging money for the infant please provide facilities with respect to that.