Complain? Depends on the purpose of your complaint.

If all you want to do is let the FT community know what happened, you've done it.

If you're just trying to let the airline know what happened, forget it. They already know what happened. It's 'case closed' for them if they don't hear from you.

If you want to let them know you're not happy with the solution they offered, or if you want more than what they offered, then go ahead and contact them.