Call centers in India have been declining, which is why they’re desperately pressing for enhanced H1B immigration to the US. Call centers have been moving to the Philippines and to US WFH, because everyone in North America is tired of getting an Indian on the phone reading a script.
What *has* been expanding in India is chat and email support.
Not just call centers (all inbound phone scammers are from India), but all back office functionality - finance, outbound sales, medical - moving to India.