Airtel — have to restart phone to get mobile data

I am facing signal problem since last 5 days. Despite having 4g sim and handset getting e/h at max since last 2 months. After raising complaint i was told that next update date is after 3days.
I am unable to make calls or receive calls and i have to wait for 3days to get an update. What kind of service is this?
Does it mean i have to keep a buffer sim to attend/make calls because airtel can't resolve the problem before 3days. Such a shame for so called india's best network.
Complaint number:ccnor[protected]
After 3days next update from the customer care representative was, we'll escalate your issue and will update in next 72hrs.
I have raised this complaint 5 days ago and only getting further dates for resolution. Network is getting disappeared, have to restart phone to get data. What kind of service is being provided. Really pathetic. No proper channel for escalation from customer end.