Well thankfully they're very rare instances in my experience and the great far far outweighs the bad. Still, it does illustrate that my track record for complaining over there hasn't been good.
Just to balance it out, we have this awful track record with Citricos. We booked once and it was cancelled, changed the date and turned up, they had no record. Next time we booked, verified it and turned up only to find that the place was actually completely shut that day and indeed was never open on whatever day we'd booked.
So we stood there, not quite being able to believe that they'd accepted the booking for a place that was closed! when a lady came out from v&a next door. She recognised us from our previous visits and said WOW that shouldnt be possible :/ looked up the ADR number and said wow you're absolutely right theyve booked you in on a day its closed.
So she called down to narcoosees and got us a late sitting there even though they werent accepting any more reservations, filled out a complaint card with us about citricos booking system, arranged for some freebies at narcoosees and a cab at the end to take us wherever we wanted to go.
Now *that's* how customer service should be IMHO