Wish Net — blocking port and asking for extra charges to fix it

Address:

Kolkata, West Bengal, 700063

I'm using wishnet for more than 5 years now and their services was and is poor. I'm facing port block and strict nat for almost a year now and every time i tried to call them to resolve this issue they are telling me to change plan which cost absurd amount of money. I've also provided them proof regarding this matter but same old story every time. It's not only me but my friends and neighbors are also facing this problem and has proof. I'm tired of this and not gonna pay any extra money for something they did. If this still goes on i'm prepared to take this complaint to a higher authority.