I'm using jio network since 2017 and till now I am using this because this is the one of the best network provider in Indian market.
About network, they provides full day good network speed without any lag , they provide very smooth and fast internet network and good voice communication.
About customer service they all are very good and responsive, they always listen you and solve your all queries.
About the charges and billing, as you know jio is a revolutionary network when it comes then all the the other network provider reduce their charges but still jio provide best service at low price.