South Bengal State Transport Corporation [SBSTC] — Change of sit in bus

Address:

Village-Islampur,Post-Islampur, police station-Ramnagar,Dist-Purba Medinipur, West Bengal,721455, India, Landmark:-Near Islampur High School and bes

I book a window yesterday (12.06.2022)sit in Digha-via Esplanade-Arambag dept SBSTC for going on Date-13.06.2022 Time-8.00A.m.destination-esplanade. I choose my sit beside window and the no is 11 from SBSTC application. The bus no is 0105.
But today when I am ready to travel in bus the conductor told me that my sit is not that sir ... There are two 11 no sit is available in bus .. How is this possible?same number. They gave my sit another passenger..and gave me a sit in middle of 3sit.This is disgusting.why such behaviour? And there are more than 50 bus in digha depot but when we are searching in online we find 5-6 buses.. we can't find bus in our time.. solve the issue or i send a complaint letter to higher authority