Grand View BnB suppressing my rights as Consumer & GREED

I made a Booking at GrandView BnB at 45 Putney Rd, Brixton, Johannesburg, 2092 and the room i selected and booked for , had 4 adults and up to 3 children occupancy and since we booked as a couple, we wanted to bring other 2 adults since maximum occupancy is 4 and the room has two double beds for that reason but i'm refused to bring other two adults because at the time of the booking, parameters i set was for 2 adults but on the actual booking i chose room occupancy of 4 adults max. This is very unacceptable and i feel that it compromises my consumer right since i bought a space i'm not allowed to fully utilize based on their terms and conditions and this is not value for money for myself.