Recommendations for finding a local('ish?) repair for name brand quality headset?

Hiya -

I'm looking for some help because despite a lot of Google quality time, I'm sincerely struggling to get a solution.

I have a Plantronics 4220 wireless headset that I use for work (and also to connect with Bluetooth to my PC at the same time between calls), and somehow the audio is starting to flake out. It's like it only gets audio in one ear, but if I tilt my head slightly it'll get into the other ear or sometimes both. Pretty weird... it's something I might expect from a wired headset where the cord itself is dying, but not on a wireless one like this.

Anyhow, I'm very comfortable with tech stuff (building my own rigs for like 20 years now), but I've never really felt comfortable about iFixit kind of solutions where tools or hardware is involved with the hardware. I'd pretty much just rather throw a little money at a pro who can fix it in 5 minutes and charge me $50 or whatever, lol.

However when I am going to look for places that might offer repair services, all I'm getting are locations in the US... but I'm in Canada. Specifically Ontario. Anyone have a source (from personal experience or otherwise) on how I might best look up a place I can get this fixed at? Figuring out what to search for on this subject seems oddly arcane!