AI-Powered Calling Agent Development

I'm looking for an advanced AI calling agent system, primarily to handle customer service inquiries, make sales calls, and book various types of business appointments. create call summary make appointment,
integration, facebook leads,
website leads, saved into google sheet
as soon lead created system make automatic call based on instruction provided in agesnt setup
for reference Vapi.ai
google calender
cal.com
zoom meeting
call booking
google meet meeting

Key Requirements:
- Inbound and outbound capabilities

- SaaS integration
user management
payment gateway
plan feature
twilio , vonage and some other numbers provider

Ideal Skills & Experience:
- Expertise in AI and machine learning
- Experience in developing voice-based AI systems
- Background in customer service automation