I’m with nabokovfan87 , it’s their mistake and you should have better informed about the fish you bought. You could try squeezing a freebie out of them, but I don’t recommend that.
It's such an abstract concept, but over the last couple of years I have moved around the globe (taking my fish passion with me) and have re- and destocked my aquariums. Fish from the same species behave so much differently in Switzerland than in Canada.
Comment if you have also noticed this.
I have previously done Zebra Danios, Ricefish, BN plecos and Apistogramma together.
Another combo would be guppies, white clouds, and Hillstream Loaches.
Have fun with your new tank.