You already know the answer, just buy from another company and get on with it. There is no point wasting your time on Superstars website when you already know these signatures are fake as can be.
I know these signatures are fake as well meaning this is why i would never buy from these guys again. I brought a hand signed Peter Brock framed picture way back in the mid 90s from Superstars and till this day i swear it was fake? I ended up giving it away to a friend of mine for free as it also played on my mind even though my friend didn't seem to care because they thought the pic looked great.