To play Devil's advocate, was it really impossible to find a fax number or to send a written complaint to Olympus or did you simply not try very hard to find such details?
Based on your username, I'm guessing you're UK-based and I found this link with Olympus' fax number and an office address.
http://www.olympus.co.uk/corporate/en/a ... ortform.doIf you were serious about a letter of dissatisfaction, you could have sent it via a delivery service that requires a signature so they couldn't claim it had been lost in the post.
When you said you had trouble focusing on close-up pictures, were you focusing at or outside of the recommended minimum focusing distance?