Who called from 4842439050

I Let it go to voicemail. Blank 5 sec recording. Figure must be a robot call.

The person tried to offer me an extended warranty for my 8 year old car.

Caller ID from Conschocken Pa - robo caller. Saying if I want to be placed on the Do Not Call List Press #....caller blocked now.

Call came in showing number but said "unavailable". I answered and immediately got disconnected. This happened at my office at work and on my cell phone, same number and same thing happened both times.