I changed my O365 to point to Register.com for email and website hosting. Turns out Register gave me an ip address that is shared by hundreds of other customers. Now I cannot access my new O365 account and I cannot find any kind of a help line number. T

I'm stuck.  I've been spending all day trying to find a support page that applies to my problem.  I have never found a support number or a link to get some kind of chat going.  This is a lot of money to spend monthly for something that is going to be so time consuming to administer and set up.  Help!! I want out of this.