Transcript for Robocalls increasing across country
You scramble to answer your phone, only to discover it's a robocall. With a discount or an offer you really don't want. The volume went up dramatically this summer and ABC's erielle reshef on what not to do next. Reporter: Tonight, a warning about unrelenting robocalls like this one -- If you wish to decline additional offers, press two now. Reporter: Experts say before you press anything, think again. Following those prompts or even speaking into the phone confirms you're a working number and could bring on even more calls. This is Susan, with credit card relief. Reporter: Telemarketing calls, the number one consumer complaint. I want to slam the phone and I just want to talk to someone and please tell them to stop calling me, but it's -- it's a machine. Reporter: And they're skyrocketing. The FCC pointing to this estimate from youmail. 2.6 billion robocalls made in the month of July alone. 177% increase from two years ago. We've never seen the volumes like we have seen this summer. Reporter: But there are ways to cut down on those calls. Experts say, be sure you're on the "Do not call list." And if you get a call a telemarketing robocall hang up. By law, telemarketing robocalls require consent. To avoid them altogether check with your carrier to see what kind of anti-robocall apps they recommend. Tom. All right, erielle thank you. When we return -- the danger
This transcript has been automatically generated and may not be 100% accurate.