OP here.
I replied that their concern without compensation was unacceptable and asked my case to be forwarded to a supervisor.
I asked for 15k of the 30k Avios I used to upgrade from WTP to J to be refunded.
She refused to do that but they would deposit 6,500 Avios into my account.
Again, I should I have said something while onboard but I was trying to sleep.
Life goes on....