I received a boot for my broken toe from my doctor...

I received a boot for my broken toe from my doctor. Several months later, I got a letter from a collections agency claiming I owe DJO Global $50 for the boot. It's $14 on Amazon and I never received a bill. Ends up, DJO had an extra letter in my address and the bills were bouncing back to them. Instead of calling my doctor to get the correct address, they sent me to collections. After several hours of phone calls to the collections agency and DJO, I was able to get this taken care of in January. Then today, 3/25/20, I received a bill from DJO, dated in early February & with my correct address, for $50. They need to get their act together.