Why bothering writing a review for such a big com...

Why bothering writing a review for such a big company?
Actually not very sure, I am just another regular client.
I am not only unsatisfied but concerned and scared about what does having a "renamed" health insurance really means here in USA.
After paying for more than 2 years my insurance (this is the time I arrived in the USA- originally from Europe) almost 1k a month, I required an emergency visit to a doctor due to an infection (My regular doctor would not have given me an appointment prior of a month later).
I got charged, for an emergency 250$ on my way out. I could not believe it- what do the people with half of my incomes do????.
1 month later I received another bill for 330$- plus an invoice showing the expenses- clearly show the total amount of 500$.
The employee who took my call said I should be responsible of reading my policy, and that is the single answer I received after paying 250$ + a bill of 330$ .But the invoice shows 500$ as the total cost of the EMERGENCY visit.
Shouldn't be an emergency covered by an almost 1k insurance??????
What's going on?
I can see why there are hundreds of people dying on the streets and millions of veterans destroyed at their houses without having the "right" of a single emergency!!!
*Not to mention that 2 different people came on to my short emergency visit just to promote flu vaccinations complete overwhelmed by my opposition to a NON-JUSTIFIED vaccine to a perfectly healthy woman on her thirties ( it was-is on SPRING season almost summer).
Flue vaccines are free, but be aware of an emergency.
This is SERIOUS. We are talking about HUMAN BEINGS!.
wake up world farmas are paying this insurances to give you flue vaccines all year around....but they wont help you during an emergency without taking loads of money from you even with an insurance.