Who called from 4752230292

Called my cell.  I called back when I couldn't find any information about the number online. Got a message saying press 1 to opt out of future promotions. I thought that was what the DNC list was for... I blocked the number.

They have called 3 times in 3 days,at various times. I'm on the DNC list but I wonder if it works?

Several calls from them.  Caller ID shows "L7 SCVC CALL".   I don't bother to answer my phone anymore because I get calls from several thieves a day.

I have gotten this call from this telephone number 2-3 times a day since 5/26/2015. I am on the DO NOT CALL LIST.
What do they want? If you answer the phone, which is normally do not do, no one is on the phone, What is the point
of calling someone, when you don't leave a message, or do not answer?

I received at least two calls a day from this number but did not answer at first. When I got tired of them calling and did answer, they said they were looking for a house to advertise their home security system.  Told them I already have a security system and not to bother me anymore. Doubt if it will work! These people are criminals and don't care about the Do Not Call List!!!