Indian Railways — regards identity proof

We are traveling in train no.12833 from nadiad to raipur with pnr no [protected] in a1 coach seat no 13, 14, 15, 16 as one senior citizen is with us. We are not having physical identity proof but we are having aadhar card in digital form. Checking staff not considered that and fined us with heavy amount of rs.3740. Is this fair in the time of digital india. And it is clearly mentioned that aadhar card in digital form is acceptable.