What is your Growth Hacking Strategy on Early Stage with Customer Acquisition for the first 100 Paid customer ?

Please tell your real case study story on the experience with these guidelines : 1.Name of your company or (your client company if you are the consultant) and the main product or services 2.Describe the early stage problem for customer acquisition that the company face before determine what strategy will be use to solve the problem 3.Which strategy had been used and how is the implementation from your journey 4.The end result after strategy had been used ( it's very helpfull if include some data like how much the sales growth or revenue growth on percentage or Nominal Currency)