AT&T U-VERSE This started in January,I asked for "information ONLY" on u-verse. The person signed me up cause about a week later I received a box in the mail with electrical equipment to hook up U-verse in my home, Internet

problem with u-verse:
(All this took place on the phone from the biginning of January 1,2011, I SIGNED NOTHING) 
      
   I asked the at&t guy for information on u-verse. I never asked to be signed up. I only wanted Information. He signed me up and I found this out when I received equipment in the mail from at&t. I called them and found out that he had made me an appointment for someone to come to my home and install u-verse. When I told them that I didn't want that and that I didn't want u-verse, they said mail the equipment back and they cancelled the order and that was all I had to do. Then later that same month, I received a "bill" from them for $108.52. Now I am being hounded by a collection agency for the $108.52 and I am worried it will hurt my credit. I don't know what to do and I don't think it is fair to have to pay this when there were no services rendered. What can i do? Please help me.