Hi,

Providing incorrect information on the answer sheet comes under The definition of unfairmeans according to neet information brochure.

as you have filled wrong roll number on the answer sheet your result be be get cancelled or not get declared.

Unfortunately you can not do anything now.

However you can try to main The nta neet about the problem. If they consider it than only something can happen otherwise your result will not be declared.

Hope it helps.