Have assignment, wholesaler lying that seller backed out. help?

[Jackson Long]

Okay guys- this might belong in Legal- but its a weird enough situation that I wanted to cast a wide net.  

Wholesaler went into a deal with seller- contract specifies it is assignable.

I went into contract with the wholesaler.

Wholesaler contacts me and says the deal is dead that the seller backed out.

He is a bit shady and I smelled a fish so I contacted selling agent- agent says they close in a few days and that its the same person who was in contract from the start.

What do I do?