Can't make account

Hello. I’ve come across a problem. I made an account and later realized I could not change the username. I deleted the account thinking I could make a new one with the same email and phone number. It didn’t want to take the same email so no problem, I used a different one. However, it seems the phone number has to be different too? It just says a user with the information already exists. I believe the username is available since nothing comes up when you search for it on LFG. Any help would be appreciated. Thank you.