Feedback..........s

Lately, I've been seeing the word "feedbacks" (cringe) being used in email correspondence by someone higher than me...not knowing how to approach the person, I sent a msg to a person in "authority" and asked if she could correct the person as there was no such word as "feedbacks" (cringe again) This is what I got:

person in authority: Hi!
me: plural for feedback is still feedback right? was wondering if you could correct _____
person in authority: actually, there is
person in authority: the plural form is already being used
me: oh, ok (then faints)

Ok, I didn't exactly faint but I immediately tried to search for a site on the net that supports what was just shared with me. Unfortunately, I couldn't find one. I dared to ask my parents (who are both English professors) and they both freaked out. I had to endure almost an hour of my mom's famous English lectures (famous with her students, that is)

Since questioning those in authority almost cost me my job a few months back, I have decided to be quiet and warned my direct reports not to use the word. I somehow have concluded that there are some people who have decided to invent a new word for their convenience, regardless of it being grammatically right or wrong. In the meantime, until I have found a document or anything that says otherwise, "feedback" remains the same, be it in plural or singular form -- just like information, stuff, etc.

Now feel free to correct me if I'm wrong here..and make sure you can support your argument :)