Excitel — No internet connection/poor internet speed

Hello,
I am using excitel internet 100mbps plan. I have upgraded this plan from 50mbps. The problem is i am getting poor internet connection issue almost daily, and i have complained so many times but there is not a solution yet. Excitel customer care makes promises but they havr failed eveytime. At this pandemic time everybody is working from home to stay safe which we are also doing same. So for work from internet is required so i have upgraded the plan and make advance payment for 3+1 months and now excitel is not able to provide said service to the customers and when i asked for refund then they simply said that its not our policy to refund in prepaid connections. I mean what is this..?? Literally!!
On the one hand they are not providing service and on the other they are not refunding either, i mean what is this...!!! I am following up this from past a month approx but they didnt find proper solution yet to my problem.
Please help, please please.
I am literally tired of making complaint and getting no solution at all.
I will b highly obliged, please do something.
Thanks.