Check out one of the many free or low-cost video conferencing options which allows easy "face to face" communication. There are a host of tech tools to meet this need - Skype, GoToMeeting, FaceTime (commonly through iPhones), Facebook Live. Microsoft offers Microsoft Teams.
Send invoices digitally and allow your customers to pay without visiting your store or location. There are many low-cost online invoicing systems which allow you to send invoices and get paid online, for instance Wave Apps or Invoicely.
The Federal Trade Commission has resources related to COVID-19 scam calls.
Restaurant technology options can be found under the "Food Retailer Specific Resources" tab.
As of March 19, 2020, NLX Inc. is offering free automated contact centers for Government, Education, and Non-Profit Organizations who are struggling with the influx of calls and inquiries as a result of the COVID-19 pandemic.