According to the 800,000 tweets analyzed, the company that customers complained about the most was Delta Airlines! See the complete list of offending companies.
11. Can’t get a human on phone
Many phone steps needed
Long wait on hold
Extras are pitched
No apology for problem
Boring hold music
0 2 4 6 8 10
Scale 0-10, with 10 being the most annoying.
Source: Consumer Reports