Akitoshi Okamoto, 71, was taken into custody last week for apparently inundating KDDI Corporation's customer service department with toll-free phone calls over an eight-day period.
"He demanded that KDDI staff come to him to apologize for violating his contract," a police spokesperson said of the situation, according to AFP. "He also repeatedly hung up his calls immediately after placing them."
Okamoto also allegedly called the customer service line from public payphones.
He was arrested on suspicion of "fraudulent obstruction of business," according to investigators.