Konkan Railway — refusal by co-passenger to sit on the seat no.18 (upper berth)

Address:

Belapur Bhavan, Sector 11, CBD Belapur, Navi Mumbai 400614, Mumbai City, Maharashtra

On 20/10/2019 i was travelling by 2ac coach no. A1 having berth no.18 (Side upper) by 10104 mandovi express from vaibhavwadi station to mumbai. The train scheduled to arrived at 11.31 hrs. Arrived the station at 12.25 hrs. When i boarded the train and moved to my berth, the co-passanger who had boarded at kankavli station found sleeping on the berth no.17 (Side lower) opening the seats, refused me to sit on the seat no.18 saying i have upper berth. I suppose, it being day journey, co-passanger has no right to refuse other passanger to sit on his seat. I would like to know whether co-passanger can refuse during day time and also i would like to know the the policy/provisions in this regard.