Close - it's fraud. Or at least it was fraud in my case. and the # is actually legit - you can make them verify it by asking them about how you have used your card. If they're legit, they'll tell you the last charge, etc. (see my post below)
This number is from Bank of America's Fraud Services department, located in Newark, Delaware. I know this because my husband is a manager there, and this number pops up on my cell whenever he calls from his office (it's a direct line that calls out but does not accept incoming calls). They monitor checking accounts, credit cards (activity on existing accounts and suspicious looking applications for new accounts), and wire transfers ... so there may be any number of reasons why they are calling you. Please take it seriously. It's amazing the ends that bad people will go through to get your info, which is why I understand the concern everyone's sharing here. It's good to be vigilant about personal information, but this number is legitimate.
Also, there are maybe 5,000+ people who work for Bank of America in their Newark office complex, so it's more normal than you think to not speak to the original person who called. Or, for the customer service rep to not be aware that you spoke to someone else previously.
For what it's worth, I chatted with Bank of America through my online banking portal after I received a call (with no message left) from this number and they said they didn't recognize that phone number at all. I also had them check all of my accounts for any suspicious activity and they said everything was fine.
I have a freeze on all of my credit reports so if someone was trying to open a credit card they theoretically shouldn't be able to, although I'm not convinced that it could never happen. The BoA person I talked to could have just been too lazy to actually check the number and my accounts too. So, I'm going to keep a tighter watch on all of my accounts over the next couple of weeks just to be absolutely sure nothing is going on but, as of this point I'm thinking the number is a scam.