The Ultra employee who said that had no technical qualifications. I don't think anybody at Ultra does because several years ago, back when they still had a forum at their website, I asked if their V-Series PSUs had thermal shutdown. They had to refer to the actual manufacturer, Wintech, who told them the PSU didn't have that protection but would inherently start cutting back on power at 55 Celcius enough to shut down before burning up (reassuring).
My only Ultra PSUs are some old ones made by Wintech that were free after rebate. One came with a couple of ground wires that weren't soldered because they were too dirty, and a capacitor on the low voltage side came really close to touching a 120VAC lug (that capacitor was bent down for greater clearance in the other PSU, which probably came from a different factory or production run). Also the fan wouldn't turn on if the PSU was cold and the room temperature was oo low -- bad design.
If you bought the PSU with a credit card, do a written "billing error" chargeback and say you do not "accept" the product because it's not only defective but so is it's warranty (you paid for a warranty but didn't know it wouldn't be honored). Mail this to the special address for billing inquiries because that will put the credit card issuer under certain federal legal obligations, and they'll be responsible for correcting your bill, regardless of the merchant paying back the money (but don't be surprised if the card issuer denies that -- they often misinform consumers about their rights). Your only obligation is to _try_ to return the merchandise to the dealer. And while you should provide proof of purchase, a copy of the warranty, any advertising claims, etc., you're not obligated to do so, contrary to what the issuer says. If the card issuer gives you a hard time and it's a Visa or American Express card, contact those companies because they're good about making their member banks comply. Mastercard seems to be a lot worse.