IRS Call from TX 7/10/19

My husband got a voicemail the other day and the message was that there was a problem with his Social and needed to be called back immediately needed to call back it was a legal matter. It was the WORST voicemail I had to listen about 10 times and the number was not clear but was the one that the caller ID repeated. the number is 469-998-1280 I called and called been calling knowing it’s a scammer however the line is always busy. Not sure if that means it has already been taken down but I did report it to the ACTUAL IRS who said uhhh no thats NOT us LOL… Thanks for any help or information on the number

Vapin Jenn