Where can I get a straight information?

I have been talking with a DirecTV set up technician.  I have a 4 room whole home DVR system.  I was asked them what it would take to get DirecTV on Demand.  I was told them that I also have wireless network in my house as well.  They told me that I just needed to go to Best Buy and purchase  an item to get the HD DVR connected to my wireless network.  I was not actually certain what I needed, so I called customer service.  They began telling me that I needed to pay $130 to get it set up on my whole home set up.  I told them to stop right there, because I was not going to pay that much for something that I was not even sure that I would use.  I had to pay $200 to get what I have now.  It seems like every time that I call customer service I get the run around, so I do not know where to go to get the straight information.  Someone please help!!!!