It would help if you had your own wireless router, instead of relying on your Internet Provider's gear.
As you're discovering, local service providers are almost useless when it comes to resolving issues if you have one device that cannot access it. As long as one device can access it, it works. If other stuff has problems, then you're making a mistake and need to talk to the other manufacturer....and here you ware.
Most any router can be set up as "pass through", via a network cable, with your IP's box for internet service. If you move, or if your provider changes box, you local LAN doesn't need to reconfigured from scratch. I know this isn't the answer you wanted to hear, but you need to remove your dependence on your service provider's access point.
Use your own router in "pass through" mode, and connect to the provider's box via a network cable for internet access.
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"Fooling computers since 1972."
