Don't ever say yes! I think this is legit since I just talked to a woman from there and it sounded different than a scam call but never say yes, scammers can splice your yes into some pre-done script and ship you scam supplies or whatever then use your spliced "yes" to try to make you pay for it. I always answer with a "that is our address" or something that would be hard to turn around to make it look like I'd ordered something I hadn't.
Identified herself as Lana Dorfman from the Costar group and requested personal information. Has called four times demanding to know personal information and promises to stop calling if I disclose. Has called home and cell numbers (both are on DNC list).
Called my business, asked me to confirm our address, then asked how long we had been here, then hung up. Not sure what they wanted, and I didn't get the chance to ask...