Got a call from this # (automated) staying it was the IRS and I needed to call back immediately. I've gotten these scam phone calls in the past but I must say it has been awhile. So I decided to call back to tell them to remove my # from their list. Boy did I get a disgusting earful. The guy told me that there were steps to take to get my number removed. I said okay what are the steps. He then told me he would have to #@%$ me in my @$$. He politely asked me to pull down my pants, then my panties, then to make some noises like I was enjoying myself and it went on from there. I was violated over the phone!!!!!!
Unfortunately that's a risk you take and a price you pay when you're returning calls to unknown numbers. No kind of answer from your end means the caller's unable to leave threats or anything. With such threats as these, you should know it's a scam and refrain from returning calls. The IRS is not in the practice of randomly calling folks and handing out threats.
Consider getting a call blocking device (or app for your cell phone)-they're available online and start around $45. http://800notes.com/nb/search?q=call+blockers