Something really weird just happened. Beware of WECU scam...

So my mom is elderly, shes tech illertae and scam paranoid, in a good way. She just got a text about 45 min ago saying basically someone is attempting to transfer 3000 into her account, reply yes or no. So I go over there to check it out. When I get there she's buzzing me in and hangs up on someone which I didn't even realize at the time... First off she's not a member of WECU so I googled the 800 number from the text and nothing really comes up so I then block/report spam the number and as soon as I do I get a call from a local number. It's a gentleman saying he's from fraud prevention at wecu. My spidy senses go on full bore and I ask him to prove to me who he is. He repeats who he is and told me to look up the number. The freakiest part here is the number he called from is wecus main number. I keep trying to explain what happened and he kept interrupting me so that was my next clue. Besides I terupting he was very professional and American sounding, no accent. Then he's saying he can't find my mom's info and I tell him she's not a member. He was just like, "that's so weird". I kept getting a bad feeling but that was fighting my logic of seeing his legit number but my gut won and I said, "can I please call u back at your line", and he said, normally yes but since it's the end of the day and he's the last one there and no ones at the front desk it would just go to a machine. Then he asked what my mom's bank was and I said I don't feel comfortable telling u that and I asked for his name. He gave me the name Benjamin Wilson, then immediately hung up on me. I called back the number he called from but it just went to WECUs machine since they're closed today I tried calling their fraud line but it's closed as well. After this my mom told me he tried calling once before I got there and she didn't answer then he called when she was buzzing me in but said she couldn't talk and hung up on him. Watch out everyone