It's difficult to make allegations against any country, The Philippines included, when Americans are currently behaving the way they are on the mainland.
I sailed through the Philippines on my way between Australia and Japan. My boat was hauled and painted in record time, for a very fair price, and I found the locals to be pleasant and helpful. Pointing the finger of corruption is a shot which can be made in many areas of the world. And while it may be a legitimate call in your case, it is no different to the man who charged my wife almost $1000 for an $80 repair on her car in Nashville.
I hope you didn't suffer too much loss in your corruption event. Were you sailing through?
"if at first you don't succeed....Redefine success"!