Byju's — Worst customer care services

My brother downloaded this app but didn't pick up calls of customer care for two or more days. So one of them called and started yelling on my mother and sister. When I confronted that guy. He was so ignorant about that thing and instead of apologising he started saying anything to me. Like is your brother that small?? and is anyone in your ever been to IIT (this was said to my mother)?? If you're not satisfied delete the app!!! All this was said to us just because my brother didn't pick up their calls.
Is this how the customer "care" service works in byjus?!!!
Literally the worst experience of my life with these so called customer care services. This is the number of that customer care person -: [protected]
I still do expect that a customer's voice will be heard.