I was sold a bedbug infested mattress by my landlord, and can’t get rid of the bugs and a refund for the mattress. This sucks.
I used to be an apartment manager, and we experienced bedbugs in our complex. Now that the mattress is in your house, I guarantee they’re not limited to the mattress. There are pesticides, but the most effective thing we found was food grade diatomaceous earth (we bought Exo Dust). It’s much more natural and healthier for humans than pesticides and seemed more effective too. I’ll see if I can find a link.
JEDIT: Not the same brand but it looks like the same product. Seriously, buy this and use generously and you’ll be alright!