I couldn’t possibly cover them all but the one that sticks out to me is that they were totally fine bricking old products to try and force users to ugprade to new ones. Fuck Sonos, they’re awful in many ways, but that’s the one that made me decide I’d never buy anything from them and warn everyone about them whenever they came up.
Or, do bring it up and if they’re a douche, contact your credit card company and have them issue a chargeback to the company (which costs them money). I’ve done this before to shitty companies that tried to deny legitimate refunds, it works.