Free Sample return us much business

One day,one of my customer Mark asked me for the free sample for 2600mah power bank.According to our company rule,he must pay for sample.At first ,he didn't accept.Then we connected with each other for some days.I promise him free sample,but he should pay for the freight .Finally we begin the cooperation .
After he tested the sample, his feedback is very good. Last week,he placed 3k order to me.It is really a good lesson for me that i should do my best to service my customer.

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