Reliance Jio Infocomm — regarding internet speed in jio

Address:

India

Ian complaining about internet speed since a year and a half in jio. But i am not getting satisfactory solution. Every time when i call them, i receive a reply saying "many costomers are using internet so you are facing such problem. We are working on it".
It's been a long time ian facing such problem.
If they are not able to provide facilities than why do they charge for internet?