Extremely irate client for poor communication and poor customer service

Worst customer service ever, had no stable connection for almost 2 months yet I pay all the time for a service I'm not getting any joy from, and their line always drops when you call you can't get through to anyone, they have very rude agents on their WhatsApp chat who don't give out their names and never fulfill their promises, I was told last year August by one of their managers Jesse Torque that I will be moved to their fiber since I always have network issues and since then no communication from him, what does one have to do to get proper service they are paying for in your company though?