Rite aid demanded justification letter

I have chronic back pain and shoulder pain. I called to see if my prescription was ready. They said that I needed a justification letter from my doctor. They said they would let it slide this time but the next time I need a letter?! Has anyone experienced this? She was asking why I’m on this medication for so long. I’m thinking to myself wow it’s none of your business. I’m on Norco 4x a day, gapatentin 500mg 2x a night and Tizadine at night as well as lidocaine patches.