i just got the call from this number 2 times already and i did try to call it back it gives a busy signal everytime and doesnt leave a voicemall

i just got a call from this number i had no idea who it was so i didnt answer i go to call back an all i get is a busy signal, i hate getting calls like this GO AWAY

Recieved a call from 708-683-5430 today for the first time. I answered but no one spoke back. Called number back but the line was busy. So, I googled the number to find out where it was coming from and it shows Illinoise. The call came in today 3-12-11 at 5:08 pm.

Would like to know how to block this number.

I've been getting a bunch of calls by  Education Advance by several different numbers.  I didn't verify that this number is from them but it most likely is.  Other numbers I got called on that IS Education Advance is:  888-455-0163, 866-396-5767, 800-793-0282, 925-206-3902.  Can anyone verify who this number belongs to?

i keep getting calls from this number 708-683-5430 and no answer plase make them STOP