The full idea of an Internet service provider that provides support for Linux boils down to their technical support offerings. The way the real connection of the internet works to your operating system is irrelevant. Most Internet service providers do not have any official support for Linux because there are too many variations to handle. Your best bet is to meet with a senior tech who might be able to help you.
When phoning your ISP immediately inform the agent that you are using Linux.
If applicable, tell the agent whether you can translate their Windows Steps into Linux Steps, if they stick to the spacecraft in contrast to the walk-through view.
Specifics: “What IP address is currently showing on your computer.”
Walk-through: “Click Start, now click Run, enter” cmd “….”
Tell the agent what level of computer education you have and what steps you have already completed. It can avoid passing through any computer-related steps and start by focusing on modem or ISP.
If you were able to isolate what the problem may be, tell them.
If the agent is confident that the problem is with the operating system then ask if you can talk to the Senior Technical Agent who can have experience with Linux.
Do not allow agents to say things like “Linux is not compatible with our service”. This is completely wrong because all providers should stick to strict protocols to work with Windows and these protocols are fully compatible with Linux.