It says that my phone number is already being used

For some reason when I logged into warzone I used the wrong account, so when I tried unlinking my Blizzard account from Activition it wouldn’t let me. So when I put my phone number on my main account I tried logging into Warzone but it said that my phone number was already being used on a different free to play account. But when I delete the phone number from the Account it says I need a phone number to play Warzone. I’ve been stuck here I don’t know what I can do I’ve tried everything a new email I deleted Warzone, but yet I still can’t do anything.