I need a local in New York to visit client

We have communicated with the client about reel products. And we shipped two samples to him for testing and he said they were OK but waited for production manager’s approval. Later they didn't give us any feedback. We sent regular email to him but no reply. Our reels are for rolling the fiber optic. The client is manufacturing the fiber optic. Requirement: We hope a person to contact and visit the client as our sales representative to know what made the approval red light. How to proceed the business. Help us to figure out: 1. What’s problem of the product? 2. What we can do for them?