Novice II

I have had this service for going on 3 days. It took me two days to be able to get help to get my service activated. I need to see if there is a way to change the phone number I was given. It rings off the hook with spam the same with text messages. I have several online accounts and they require a phone number to be on file, well this number is already associated with a couple of those accounts so I’m unable to update my information. I’m beyond frustrated beings I can’t even get ahold of customer service via chat, twitter, or messenger. Does anyone know how I can go about getting a different number?