This isn't an errant bill or anything. The person called long distance that much in two months.
Wow does that bring back memories. For those who weren't around in the dialup days, certain malware would change the default dialup number for your modem to a 900 number (where you're charged per minute, like phone sex services use), which would then redial to AOL or whatever number you were trying to connect to. So you wouldn't notice anything was amiss because you'd still connect to AOL like usual, but you'd be racking up phone charges at $3/min.
After the government cracked down on phone companies which provided the 900 numbers used this way, the problem mostly disappeared for U.S. numbers. The malware switched to making the modem dial the equivalent of a 900 number in a foreign country.
It sounds like he got hit by this type of malware.
This also brings up something I've always wondered about. The power companies I've worked with seem to bend over backwards to get you onto the plan which most benefits you. When the electricity consumption at my business changed dramatically, Edison sent a guy over to talk with us to figure out what caused the change, and how to adjust our equipment and power plan to minimize our cost. Why does the power company do this, while the phone company seems content to leave you on a plan where you're paying more for worse service? I type Woodland Hills, CA DSL into Google, and it says that 6 Mbps AT&T U-verse/DSL is available there for just $34.95/mo.