Affordable AI Indian Calling Solution

I have already trained the voice, wired up the backend logic and run successful test calls through Vapi + ElevenLabs, yet the moment I move toward production the per-call price shoots up and the whole idea stalls... (Budget: ₹600 - ₹1500 INR, Jobs: Android, API Development, Asterisk PBX, Mobile App Development, RESTful API, Telecom Sales, Telecommunications Engineering, Twilio, Voice Agents, VoIP)