I would also mention it to the FA, and nicely ask the Purser on your flight for a Customer Service Amenity Envelope.

They carry a supply of these for just this type of thing (along with accidental wine spillage/stains and numerous other instances where some compensation might be in order).

The Purser fills it out (including their name and file number), indicating what the problem was, you add your name and address to it, and they send it in with the Company Mail.

You'll likely get a $200 Travel Voucher for being a C customer with this sort of problem.

Much easier dealing with these things on the spot, rather than after the fact, IMHO.