Customer Service lies

For two months my service didn’t work properly. They finally sent someone out who confirmed without a technician coming the service never would have worked due to the wires having eroded on the poles. I was told on multiple occasions that I was getting a $450 credit. I have the screenshots with the customer service agents confirming it and providing the ticket numbers. This is unacceptable. I’ve spent more hours than I have trying to deal with this.