Welcome to FT HMott. I am sorry it is this issue that prompts your first post, hopefully some happier ones in the future

Were there any other seats free in first or business which you could move to or the cabin crew suggested you could move to in order to get a flat bed for sleep? Also I think even if the motor is broken the cabin crew can manually move the seat in to a flat position, were they able to do it? I hope there was some relief to get some sleep.

Now what should have happened is the senior cabin crew member should have said they would submit the details and you would get some response for the seat problem. If you are an executive member that would usually be some avios, as noted about it tends to be around 80-140k avios. If not, then you can submit a complaint on the website by clicking the "Help & Contacts" link at the bottom of the main page, and following the links for making a complaint.

I think as noted you did receive some elements of your fare, so if you asked for a full refund I can see why you received a negative response.