Someone changed my name to theirs on my Walmart account and changed the phone number. Can Walmart investigate how it happened?

I corrected it, checked for purchases that weren't mine - luckily there weren't any - and removed all payment methods from my wallet. I changed my password and will now use two-factor authorization. I researched the name and there's a local person whose mugshot showed up, so I'm going to file a police report. Does anyone know how this could happen? If I notify Walmart, can (or will) they investigate to find out how someone was able to do that?