I can't change password, payment type or anything else

I had to get a new phone number thanks to an illegal port and since then I've had problems. I tried to update payment info but it says I need to update contact info and when I click "send new code" nothing happens. It also shows my new number twice with one "pending verification" and one seems usable but when I use that and try to manage text messages it asks to verify my number again and when I click "send new code" again nothing happens. I was on the phone with the tech support specific people (three different ones) and they couldn't help. I get the same results when I use the app. This is my last hope or I'll have to try a different carrier or maybe new number.