Justin Bieber -- Meet & Greet Beliebers Pissed ... We Didn't Pay Thousands Just For A Good Seat

Justin Bieber fans shelled out thousands to meet the singer and for a premium spot at his show ... but now they're only getting one of those perks and say it just isn't worth the money spent.

TMZ broke the story ... Justin switched up the remaining "meet & greets" for his tour, leaving Beliebers who bought passes for the event with only a ticket to his show. We're told fans have been offered full refunds ... but if they choose a refund, they lose their ticket for the best section in the house, "the pit."

One fan tells us she's tried looking at other ticket options but if she drops her pit ticket, she'll be stuck paying at least 4x face value for a seat in the nosebleeds.

Fans are letting the event organizers have it on social media, demanding some sort of smaller refund so they are able to hold onto their spot at the show too ... but we're told it's full refund or nothing.