Airtel — data connection while calling

Address:

Kolkata, West Bengal, 700010

Whenever i am calling someone or receiving a call, my data connection completely switches off. I can't use internet while calling no matter what. I informed customer care, but they are not even acknowledging the issue. I am using pixel 2. I checked my sim with nexus 5 x and iphone se. Same issue. I do have another airtel sim. The same issue is faced with that one as well. This issue started on the day when airtel started providing volte. I checked my phone with jio sim, and found the issue is not there. This issue is entirely related to airtel service. Please fix it and provide an eta. Please don't force me to port to another provider.

Thanks