if your company is loosing the contract, this is a problem of your company, not the end client. GSS is not and never been BA.
Star Air is loosing their UPS contract. Should Star Air pilots be angry about UPS?
GSS did not "lose" the contract, it had been signed for 5 years. BA chose to walk away from it. Slight difference.
GSS never pretended they were BA any more than Atlas pretends to be Emirates or anyone else they operate on behalf of.
If Star are loosing their UPS contract then that is very sad for the Star pilots and I'm sure they are pretty upset with UPS.
GSS flew BA liveried aircraft for 12 years without incident. During that time they never once drove a 747-400 into a building unlike their oh so perfect customer who seem to think they are such gods of the sky and deserving of everything and more.