How do in-house marketing operations agencies measure satisfaction in their clients?

Agree with Mr. Nasir Hussain. 

 Thank You.

In-house marketing operations agencies usually measure their customers' satisfaction by obtaining data that includes:

1- Examining recent correspondence with customers (specifically emails and letters). 

2- Calling a random selection of customers and asking them what they think of the products and services they have bought. 

3- Own postal or web-based surveys.