There is help: even a specific thread for just your (potential) problem:
https://www.head-fi.org/f/posts/13214769/
I can feel your frustration, but please be relieved: even if it is a fake, that must not be bad at all.
About a year ago there was a large and vital IE800-fake-industry (I'm not kidding) which meanwhile has dried out a bit.
I had bought some used ones in Germany via Ebay for $200, only to find out via the mentioned thread, that they were fake.
Initially I was very frustrated, but I found their sound not bad at all, and in the thread I stumbled upon a poster (IIRC Rob80b or so) who had possessed real ones and fakes, and he told that his fakes were not 100% exactly the same as the original ones, but as good soundwise, and sometimes he preferred them over the original.
So I went to a German Sennheiser dealer and made a thorough comparison with an authentic IE800. I ended liking my fakes more than the authentic ones, although money was no objective. Ok, such is life, very specifically in the psycho-acoustics arena...
Then I tried to get via AliExpress a 2nd pair of fakes as good as the ones which I initially got by "bad" luck. Because I wanted to have a reserve in case my 1st one would get broken. This attempt went into a cumbersome journey taking many trials, and at the very end I now own 2 nearly identical excellent fakes, 1 low quality fake, and 1 very bad fake.
That's my story. And I continue to be happy with my specific fakes. I will do a new comparison only once the IE 800 S has become sufficiently available for testing.