RMB, Inc. Debt Collection Complaint

RMB, Inc. Debt collection department,

I do not know Disclosure verification of debt Not disclosed as an attempt to collect Alabama

A man called from a company called RMB - which I am not familiar with - and asked me to verify the last - digits of my social security number. I asked why. He said " it is a personal matter. '' He told me the last - digits of my social and again asked me to verify that those were mine. I again said, " why do you want to know? He said, " it is a personal matter. '' I told him I would not verify, so he hung up. My husband called the number and spoke with someone there who would still not disclose why they called me. Or what the business matter was. I only know they are a debt collector because I looked up the company online. At no point did the caller identify himself as a debt collector and he revealed my personal information without verifying who he was talking to. I am wondering if this company is legit.