story
Changing the facts
Your mistake was paying for it in the first place. You should've taken it off the bill and paid what was left. If the waiters get upset and there's no manager around, give them your name and contact details and leave.
They've got your money now and getting a refund would be a shitload of hassle for the sake of 17 quid.
Take them up on the 2 freebies.
I decided not to upset or stress out the waitresses. There was blushing and eyes darting between them. Neither was in charge neither seemed able to make a decision. I didn’t want to make the rest of their shift miserable.