Ibibo Group / Goibibo — Charging hidden amount SCAM

I booked through ibibo for an OYO hotel room and paid online. On arriving at the hotel the receptionist said I have to pay extra 500rs ( in cash and no receipt was given for that ) . When I asked why he said that goibibo is not changing the price we have mailed lots of times and that we won't get any refund also goibibo will cheat. It was late at night and we did not have a choice but to stay there by giving rs 500 extra. There was no helpline number and the call was available on the next day only. When called they asked for invoice . I said he did not give any and asked to pay cash they said they can't do anything without an invoice. The hotel had many reviews stating the same cheating incident charging people more . I asked if they can remove the hotel from the Listing but they did not even hear . Worst behaviour on behalf of goibibo and OYO. Since they are partners they can pull up the CCTV right ? For which I asked . They did not respond properly . I'm planning to move legally . Please don't get cheated anyone . DONT BOOK on goibibo . It's the WORST.