service

https://en.wikipedia.org/wiki/Customer_service
http://www.customerservicemanager.com/
https://www.customerservice-macys.com/
https://addresscustomerservicecenternumber.com
http://customerservicezone.com/

Tube / Slides
https://www.youtube.com/results?search_query=customer+service
https://www.slideshare.net/search/slideshow?searchfrom=header&q=customer+service