Sheraton Hotel — appointment letter and invitation letter

I have received appointment letter and invitation letter from canada sharanton hotel. Is this documents real or fake. His name is patrick chris gafar from canada and he says that he is the ceo of sheraton hotel which is located in canada ontario. I have already paid 15000inr & he is asking 30000 more to pay. So before doing that i want to confirm that is this documents real or fake.