sounds like your Modem is toasted. I find talking VERY loud & angry like (no naughty words) is the best way to get your point across.

I fought for a week, trying to tell Rogers my internet wasn't working on my end & I didn't have access to their gateway. They kept telling me it was because I was running Linux

SO I was fed up, & yelled at someone to get off the lazy butts & take a real look!! So the guy said, I'll redo your account, & guess what. I had internet, YAY.

I still gave him a bit of lip, because I was quite mad. Then I hung up on him.