Airtel — I haven't been able to contact customer care at all.

Address:	Mumbai City, Maharashtra
Website:	Airtel.in

I have constantly been trying to contact customer care to restart my call waiting on my Airtel Sim, and I've gotten no response so far. How am I supposed to know if someone is calling me while I'm on a call if my career operator won't put my call waiting on?
Except that today I did a recharge of RS. 49 - 3 GB data pack online on the Airtel app and the pack hasn't activated yet. Why is there so much problem?
I've also had issues when without even using internet, all my internet balance disappears. This is very disappointing. I hope Airtel takes action and does something.