Really annoyed

I purchased a new Hd decoder on Mon..and asked the consultant if she could block my old decoder and she did.I ask her would I need to do anything or call someone to connect it for me and she said no I just need to connect my new decoder and it would play all my channels.I called the call center later on that day and they also couldn't assist me until I ran out of airtime.Today is Wed..and my decoder is still not playing and now I need to call someone bcoz I can't watch anything.This is really annoying because if I knew this was going to happen I wouldn't have changed my decoder in the first place