This is not spam. . This is Credit First .. they handle out Firestone Credit Card. They rarely leave messages but it is a legit call .. usually because you have missed a payment or letting you know about a new promotion going on.
I don't answer unknown numbers! This one never leaves a message, yet calls me up to 5 times a day! I am tired of it! I want to make it stop! No message means they'll never contact me!