Claimed be from Sentry and to have a client who had received a fax from someone named Cordie Suggs at our office. Refused to believe that we'd never heard of a Cordie Suggs. Wanted my name, but I said office manager was good enough. It's one of those scams where a supposed collection agency calls everyone they can find whose name or company name is the least little bit similar to a name on their "list" of old collections and then threatens you if you don't cooperate.
I find that if I tell them that I know what scam they are running and that if they call back again, I will report them to the FTC, they usually stop calling.
Or you're mentally retarded and don't realize they are a collection agency and they get told all the time by the correct person that they have a wrong #. Blame the debtors not the company. If its a wrong number then there's no reason why you couldn't just give your name and move on.