Contract between a client located in Senegal , west Africa and a consultant located in Phonix, Arizona

Hello, I would like to know the best way to resolve the case described below and if possible if a lawyer was to be hired, what the estimated fees would be. A contract between a consultant and a client was signed in Senegal-west Africa- where the client''s company is currently located at. The consultant''s company is located in Arizona, USA. In the contract, the consultant was to assist the client with some financing to assist the client in acquiring some equipments. After a deposit about 10%, the consultant was supposed to provide financing to the client. There are receipts from the consultant showing that he has received about $3000 so far from the client back in 2006. For the past 5 years, the client is trying to take back his money back, but the consultant seems not to want to pay back the money. The client would like to know is this issue can be resolved by hiring a lawyer in the US.? if yes, what would be the approximate amount of fees to pay to the lawyer?