I was recently let go, should I get a lawyer?

A couple days ago I was recently let go for “willful misconduct” due to talking about the company I was working for over the internet. I never mentioned the name of the company, though I did mention one of their clients. The client does not only do their business with said company and was just used as an example of the work I preformed for the company.

I just got a letter in the mail saying that they may pursue “legal remedies” against me for directly or indirectly defamation of the company.

Should I talk to a lawyer?