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Briefly in such case; Acknowledge your mistake --> Apologize --> Correct and Improve the weakness --> Compensate customer.
Every business dissatisfies customers sometimes and many customers accept that as long as you know how to deal with it and you improve things
put yourself in their shoe
active listening
show empathy
Acknowledge his feelings
provide service ASAP and follow the contract
Apply this five steps when you have that kind of situation
listen completely
Acknowledge their feeling and/or the sitiatio
Take action,and talk about what you can do.not what you can't do
Thank the customer for letting Know there was a problem
Encourge customer to return to business