How can I grow from a small customer base?

Suresh, Duarte, Calif.
I have an offshore call center in India. I am currently serving four clients with exceptional service. They have been outsourcing their orders and customer-service operations to us for the past three years. I expanded my operation but I don't know how to increase my client base. I purchase potential client leads from different vendor sites, but the leads are not that effective. Any idea on how we can increase our client base?

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