My Mother taught me to say thank you when somebody gave me something. CX just gave you an extra half month of salary - so you say thank you. You don't behave like a two year old and scream "I want more...now."
Take it for what it is - a TOKEN of appreciation for some of the effort you put in last year. Yes 20 years ago you might have gotten 3 months - that would be nice - but if you haven't noticed the world has moved on and that will not happen again in this company in the near future.
I have not forgotten the insult of a pay increase we were forced to take but that is a different matter. Today, I say thank you. Tomorrow, I will continue to fight for the betterment of my contract.
Keep it real and as good ol' Mom used to say - mind your manners.