GoConnect – Call Center Powerpoint Template
https://elements.envato.com/goconnect-call-center-powerpoint-template-2CSN327
Free 
GoConnect – Call Center Google Slides Template
https://elements.envato.com/goconnect-call-center-google-slides-template-X3N6JFZ
Free 
Cusupport Customer Support PowerPoint Template
https://elements.envato.com/cusupport-customer-support-powerpoint-template-4C2UCEQ
Free