Network congestion issues shouldn't be handed off to field techs to check local loop (last mile) and CPE (Customer Premises Equipment.
I guess I need to remember the ISP I work for here in Australia (front line tech support, and then network operations physical security and infrastructure) was widely recognised as the best ISP in Australia multiple years running, so I shouldn't use it as a baseline expectation.
Yeah, was a good place to work. I was in their Adelaide data centres when iiNet acquired the company.
I’m not sure what the incentives are for an ISP to try to get the provider to fix issues, or even if they would e.g. https://company.chorus.co.nz/what-we-do is notoriously bad for service and the copper network is being deprecated. Locally https://www.enable.net.nz/about-enable/ are doing a good job of service, because they are well subsidised by the government and seem to be effectively operated.