Learn Hindi, tell them you're they're long lost cousin Ravinder, freak them out.
If you think the Indian call centres are bad, try dealing with the ones in the Philippines. Yep, this is another car rental story. Get used to it, I have lots of them. We used to have to forward our lines to them at the end of the day, or if we had to leave to store. Hilarity would ensue when when you were trying to call another store that had forwarded its lines. They couldn't understand what you wanted and even that you worked for the same company. Just kept reading the script as though we were customers.
Me: Hi, this is the El Cheapo Toronto location, just trying to get a hold of Brampton. Guess they're out.
Them: Hello sir, would you like to book a car or truck rental today?
Me: Uhh, no. I work for El Cheapo. I'm just trying to call Brampton to see if they're sending us a car.
Them: Okay sir, Brampton's hours are 7am to 6pm...
Me: I know that. I work for El Cheapo. Ugh... *hangs up*
Literally had that exact same conversation countless times.
My last weekend working there, the call centre had booked a truck on us we didn't have. Literally the guy called and wanted it in 15 minutes. Oh the truck existed. It was just a 2hr round trip away at a location that was closed Sundays. We were out of everything so the counter girl goes to get a coffee. I'm there chilling and this dude walks in. So I have to explain to him we didn't have the truck. Of course I gave about zero f--ks at this point and pushed him into a panel van that had happened to return. Dude wasn't happy about it but screw him. Should have planned ahead. Girl comes back. Skinny 20 year old thing. Phones the call centre and proceeds to yell at this Filipina girl. They knew they were in trouble when they answered and stalled trying to give the phone over to girl who had screwed up. Good times.