I buy from Multishop and am very happy with the cooperation. What evidence do you need? Honestly, I have no desire to prove anything to you. Think about it, why would I need it? Maybe that's why you haven't seen any evidence? It's just that no one cares, just like me?
But now I'm really interested, what evidence would you like to see? What could it be? A photo? A video? A screenshot? A conversation? An invoice? A wallet? I really don't understand.
Moreover, any photo or screenshot can be faked. Knowing this, can you trust your eyes? I think you're just looking for reasons to do nothing and justify your cowardice.