Himachal Road Transport Corporation [HRTC] — taken more ticket price for kullu then manali

I have taken ticket from ticket window from shimla new bus stand at night 7 pm 15 dec 2019 to kullu. On which the ticket person asked for 500 rupees. I checked the ticket and it seemed 490 for the ticket. So i payed and sat on bus. When talked to some other passenger i found i was charged more. When i asked the conductor he told the ticket is of only 401 rupees. So please look into the matter and please make a clear system.