As my experience I had purchased a airtel 4g wifi and , There was a problem with this network the data was getting over then after a non usage of the wifi then too the message came the data pack is over . When consulted with a custermor care they noticed the problem and don’t not bill the prize. The wifi was still under the date of the guarantee so they replace it with a new one
The custermor care if airtel are the beat they didn’t take much time to solve the problem and the speed of the wifi is sometimes a bit slow and this the best network still far.