I get a daily call from (319) 294-7021.  Does anyone know how to stop it?

Have gotten several calls from this number in the last week.  Never leaves a message.

Update:  The calls began yesterday with an initial call regarding a survey.  I protested that I was on the "Do Not Call" list and the caller hung up.  Now the calls are coming in almost every hour, and there's never anyone on the line when I pick up.  I have filed a complaint with the FTC and on donotcall.gov.  I believe this is an 800 line provided by AT&T and shared by several telemarketers, since earlier today I found a cached ad for a "fun" job as a telemarketer for "Marketplace on First" in Cedar Rapids on the AT&T web site.  AT&T says they don't investigate complaints about telemarketing because "it's not illegal" -- but what about when they're calling people on the "donotcall" list?  Can anyone verify that this number is registered to Joann Mauck, 319-365-9738, Cedar Rapids, IA?

Have gotten 3 calls in two days. Cell phone is registered "do not call". Did not answer.

I receive at least 5 calls a day. Answered one of their calls & finally girl started speaking. Its regarding a Republican Survey. I told them to take me off their calling list & hung up. I'll keep you posted if the calls actually stop.