Hand numbness of cervical origin

I recently had successful bilateral carpal tunnel surgery after proper diagnosis with nerve conduction tests. Prior to this I had spent thousands on cervical decompression because I was told the numbness was due to my neck. In retrospect, I had no neck pain or stiffness, no arm pain, my MRI showed no spinal stenosis at C6-7 so no impingement on the spinal nerve root. I had only some mild broad based disc protrusion at C6-7 per the MRI report. No differential diagnosis was attempted or suggested. How inappropriate was this? How can I have money refunded?