Audio Tech-Metro TV Appliance & Computer

I have had an LG sound bar for about a year. Several weeks ago, the subwoofer stopped working with anything plugged into the optical inputs. I called LG, they passed me off to Metro as their authorized repair shop. The first couple interactions were great… super friendly staff, they didn’t charge me a deposit, etc. I was disappointed when they said it would take a week or two, but I figured that was fine as long as they fixed it.
They called me about a week and a half later saying they couldn’t reproduce the problem. The subwoofer was working great no matter what they threw at it. I trusted them, thinking there must be something wrong with my TV or PS3 (the two things I was pumping through the sound bar), and came back to pick it up about a week after that.
I got home, plugged in the sound bar, and same problems. I spent the next hour trying to make the sound bar work with different optical cables, different devices, etc and it was the same story. I even tried plugging my devices into an old system I had, and that old system (with subwoofer) worked great with the optical output on my devices. I discovered that the sound bar in question worked only on the 1/​8inch non-​digital audio connection, anything I threw at the optical connection didn’t work with the sub.
I called Metro back, and the guy basically said «We tested all the connections including the opticals, I don’t know what to tell you» and I asked what they tested them with (so I could try to reproduce at home) and he said just said «uh, a receiver.» At that point, I was so frustrated with his attitude about the whole thing that I just had to hang up. Definitely a huge bummer… recommend avoiding these guys.