Chimney recommendations?

Hello neighbors, We have a chimney problem that we’ve had trouble finding help with and I wonder if any of you have any ideas for us. There’s a bunch of stuff that falls down one of our chimneys. By stuff, I mean some terra cota bits that I think is the liner but also brick pieces (including an entire brick). I can’t imagine this is a good thing :). We’ve tried a few brick guys but they’ve all told us that they do tuck pointing and other exterior work but wouldn’t know what to do in this situation. We’ve also tried chimney sweep people who also say this is beyond their areas of expertise. Anyone have any advice/recommendations to share? Appreciate your help!