Gujarat State Road Transport Corporation [GSRTC] — seat reservation

I was reserved a seat in surat palanpur bus. Bus no is gj 18 z 1279. I was completed my reservation as per given seat selection in online booking and i was select 21 no as a window seat. Bus came in station and i was checked my seat.in a bus seat number was not as per given in online selection..
I want to humble request to goverment gsrtc head if you are not able to maintain a bus seat number selection so pleas do not mention as a single lady option in online selection.