"Mis-used of DNA"

After a doctor referral appointment was given for 2 months ahead for audiology, doctor thought this too long and arranged emergency appointment in ent. At this appointment it was determined audiology should be done close to other treatment and appointment pre arrange to be cancelled. When I did get a specialist appointment three months from initial doctor consultation, I queried this as no audiology or other test had been done. Secretary confirm specialist wanted to see me first. At this appointment lambasted for not attending and notes say DNA for audiology. This is a mis classification as ent outpatients failed to write to gp, failed to cancel appointment or confirm it was still necessary. How can we trust the reports of DNA.