In my experience, they do their best.
However, there are situations where they are simply unable to help because they have to follow Ebay policy and/or sometimes complex issues are too difficult for them to unpick.
As advised, if you want to explain your issue here, experienced members will try to advise you.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)