How to say that the call of the US Mission should be well received?

Wechat or telephone reminding customers is the most direct.

The content of the return visit can be: If you are satisfied with this takeaway service, please give me a favorable comment as an encouragement, and I will make persistent efforts. If you are not satisfied, I will continue to improve and make you satisfied. Your satisfaction is our greatest reward. Please give us a favorable comment. Thank you.