People who don't identify themselves on first contact usually have a reason, and that reason may not be a friendly one. For example, I received a similar message a few years ago. I kept asking who he was, until he finally gave me a phone number I could call. I traced that number to a debt collections agency that had been harassing me to pay my ex-wife's debts in the late 1980s - from the time the divorce was final to the time I moved to another state.
My ex-wife had defaulted on a mortgage, maxed out her credit cards, and used our former home as her billing address. Naturally, instead of going after her under her new name (she had re-married and also moved out of state), the debt collectors came after me.
I turned the matter over to my lawyers, and haven't heard from the debt collectors since. Had I contacted the debt collectors myself, they would likely have levied liens and garnishments against me, even though my ex-wife had run up those debts herself after our divorce was finalized.
In this case, the debt collections agent did not want to reveal his identity to me because he did not want to give me any opportunity to defend myself from his intended onslaught of lawsuits he would have filed against me. Debt collectors can get very nasty once they've "bought the debt" from whatever business they think you owe money to, and this debt collector had purchased nearly a quarter-million dollars worth of debt from the companies that my ex-wife owed money to - maybe for pennies on the dollar, but that was still tens of thousands of dollars he stood to lose if he couldn't collect.
So, what would I do? Exactly as I described. Get a call-back number from the other person, trace its origins using any on-line service (or just google it), and if it turns out to be from a scammer, a debt collector, or anyone else that you'd rather not deal with, then turn it over to your lawyers and let them handle it.
Last edited by Fnord on 18 Nov 2015, 7:40 pm, edited 1 time in total.