Panasonic — same problem occurs after four time repair

I am facing problem in my Panasonic eluga ray max 4+32GB rose gold about data connectivity with their APN settings lost after using for some hours in sim slot 1 and mobile does not supports JIO 4G volte. For reconnecting internet i have to restart phone every times.

I submitted mobile for repair at AP digi solutions Nagpur, Maharashtra for four times but not proper solution obtain yet. After four time repair, service centre blame on telecom network services but same sim cards are running good in other devices except me. I have video regarding problem and
I send video regarding problem to Panasonic executives, they promise to call back but didn't.