Reliance Jio — Harassment from JIO Fiber

I have been mentally harassed by Jio fiber customer care operatives from past 2 months.
I have taken the JIO fiber connection and its not working properly. from past 2 months i have been raising request and executives are discnnecting the phone in middle. I have requested for senior authority to look in to but no response.
I have taken plan for 1 year and they are not willing to refund my amount also if i disconnet the plan.