All customers are always right

Mr. Wong, you say-
All customer are always right
they make money in business
Yet i must share with you,
Sometime it does injustice to me
where-when i be your customer
i never feel rightly treated.

I have served thousands customers
and waiting to serve millions
Yet i must tell you,
Not all customers are always right
Only right customers are right
or i can say
all customers have their rights
to make a complaint in service.

Eventhough, I have been awarded by some
"the best employee in service"
and had my bread & butter
in some stage of my life
yet i must let you know
i mind the rule
all customers are always right