Nowhere on the site that I can find does it say it actually mines bitcoins. The site says a lot of things, but it does not say that.
You may end up getting exactly what you ordered. I'm not sure what Bit Mining is, but I'm sure I can produce a $75 device from my closet that does 4,000 MH/s mining bits of one sort of another.
Bit mining nice catch.
But watch out for making promises you can't keep. Or have they been in the closet all this time?