contains a spectacular flaw - he has made an assumption about how the plastic spacer came to separate from the port.
"This type of incident is unintentional damage caused by the user and is not covered under your manufacturers warranty."
To which my response would be: 'How can you possibly know that the damage was caused by me?'
In all the time I have been using USB devices on laptops and desktops I haven't experienced a single instance of this fault occurring, neither have I ever heard of it happening on a client's computer. It would take quite a bit of determination and physical abuse of a USB port to make the plastic spacer detach itself - unless the port was faulty in the first place.
Tell Mr. Naylor what I have said - word for word if you like - and tell him that you look to PC World to rectify the problem - either by fitting a new USB port, or by replacing the machine with a new one.