It is expensive and takes a long time to get rid of bedbugs. They get in the walls, floorboards, every where. clocks, tvs, laptops, any teeny tiny crevice anywhere. You have to dismantle bed frames, drawers from desks and dressers.
Caulk and seal all holes where pipes and wires penetrate walls and floor, and fill cracks around baseboards and moldings and this is just the start of what has to be done. Just getting a new mattress won't work. Hotels desperately try to keep the bedbug problem quiet. They can't seal up the room because money loss is too much, rarely do they get new mattresses but put a new mattress pad on it. By the time hotels, motels notice the bedbugs are a problem they are infested in the whole place. International travel is more then ever now and a lot of countries have bed bug as just something to put up with. You can bring them back in your suitcase, clothing, shoes and before you know it they are in your home.