Did you order the $4.99 chair ? was it one chair or a 2 pack ?
If its a Frum seller i'd rather not start a amazon complaint.
https://www.amazon.com/dp/B01N67GCKW/ref=twister_B01NCSCZ8B?I see now it's a two pack I didn't even realize that,i see they make a 1 pack as well but don't remember what it was as I wasn't home this week so will have to check when I get home what I got in the box. (will update you later.)
And in regards to a frum seller I don't think it is,you don't have to to worried about that in any case as your not michuyev to take a loss or the sort, here this is what the price is so they are not trying to get it on the price, so feel free to call amazon either for a credit or refund,
And lastly I forgot to mention about the T&C which says only 1 item of each per user, as when it's a great item and price they limited it to one order and canceled the rest of them,
Many times I have gotten more then one, doesn't hurt to order more and they cancel the rest.
(Limit one product per user).