Question on Verizon's return policy...

I am wondering if anyone can shed some light on this subject for me...Yesterday I went to the Verizon store to take my Droid back...for a few reasons really. One of which is the reception problem that most have been having. I live approx. 2 to 3 miles from about 3 towers and AT BEST i get no better than -90 dbm...one would think that it would be better, but this is not really why I am posting. Anyway I went to take thr Droid back and GO BACK to the original phone that I had purchased almost a month ago...I am still within my 30 days. I was told that I would have to pay the FULL price of the Storm 2 because I had it once before then went to the Droid and now I would like to go back to the Storm 2...Has anyone ever heard of this. I just went through the ENTIRE return policy and not a single thing was stated on there about how many times you can bring a phone back OR your limited options on which phones you can get if previously had...and light shed on this matter would be a HUGE help...

Dennis