From the right tools to adequate staffing, customer service can turn out to be an expensive venture for businesses of all shapes and sizes. Most of the expenses incurred come from in-house teams, usually those working in a call-center. If customers get off of the phone with your in-house team and still don't have a resolution to their issue, that can also be seen as both time and money wasted. This is especially true if the customer decides to forego your business thanks to that particular experience.
According to Hannah Steiman of Peak Support, there are a few ways in which in-house customer service can become costly: