Mumbai's time zone is hours ahead of the earliest possible time zone (PST) of the United States, around 12 and half hours. In order
to operate a call center that takes orders from the US, during
US business hours, the call center would need to be operating
from about 9:30pm Mumbai time until 5:30am Mumbai time.
In this show, it is clear that Mid-American Novelty Call Center
is operating during normal daylight hours.
The movie that this series is based on shows the call
center operating during the actual overnight hours that it would take to meet U.S. business hours.