carrentals.com cheat, deceptive enter Internet

As anyone can see if they file a report here.  Important things are in caps and red!  Not so w/carrentals.com.  When I went to their site which was expedia at first, the choices were almost all "pay now".  This is what I did, I ended up not only paying more than the actual company offers a car for,but also was unable to cancel or upgrade,which is what I wanted to do.

I called the only number they give which is to advantage car rental.  I told them I'd like to upgrade my care, they said no.  Only "carrentals.com" can do that, and they don't do it.  I was confused-he said to look at my reservation-which in a tiny font and in a barely visible gray it said-no cancellations .  What?  You can not get a hold of carrentals.com-theyhave  a small box where you can email them-that's it.  No response as of yet!

I looked up reviews and they are 1 star on several websites, plus being on here. 

Run, don't walk from this place.