Building a 10-Agent VAPI Call Center on $0: Vertical Integration, Google Sheets CRM, and 500+ Calls/Day

OPENING: We scaled from zero to a 10-agent AI call center handling inbound and outbound calls across three separate revenue streams (demolition, valet, credit repair) in 14 days using VAPI, Make.com automations, and a master Google Sheets CRM. This isn't a theoretical guide—it's the exact stack we deployed at Load Bearing Empire to hit 500+ calls daily, route leads intelligently across business units, and process customer data without enterprise software costs. If you're bootstrapping and need call center infrastructure that doesn't require Salesforce licensing or AWS bills, here's the technical blueprint: VAPI agent configuration, webhook integrations to Make.com, real-time lead routing logic, and the CRM schema that lets three separate businesses operate from a single source of truth.