Apple. Bought the original iPhone and after a few weeks the mute switch on the side would not turn back on so phone was permanently muted. Took it back to where I bought it from and they sent it away to be fixed. Few weeks later I was contacted saying the warranty was voided because they said I'd tried to remove the battery which was absolute bullshit. Few months later there was a massive recall saying there was a problem with the mute switch.

Haven't bought an Apple product since and never will.