1- You can track and monitor metrics such as response time
2- monitor your ODR
3- Analyze the reviews and work to address the issues customers are mentioning.
4- Respond to A-Z guarantee claims to resolve the occurring issue
5- Resolving client issues on time.
You can track the customer service by checking the negative feedbacks, if you have high negative feedback rate then your customer services is not good, you can track the customer service by checking the FBA returns, by checking the massages replies, by checking the Order defective rate, by the checking the A to Z claims.