We have a large collection of these letters pinned to the wall at our office. Not sure how they got our address but we don't watch broadcast TV so of course don't need a TV license. They're more than welcome to visit anytime to confirm.
I'd much rather the money that I (willingly) pay for my home TV license went towards improving content and broadcast infrastructure than going straight into the pockets of utter scum like Capita.
I suspect someone in your office got a TV delivered to work, rather than their home address. Prior to June 2013, dealers that sold TV's had to notify the TV licensing agency as per The Wireless Telegraphy Act of 1967.
I'd much rather the money that I (willingly) pay for my home TV license went towards improving content and broadcast infrastructure than going straight into the pockets of utter scum like Capita.