I'm glad you gave them a call.
Be sure to give us the update when you go and tell us how it came out!
FYI, reds are known for being difficult. In fact, my hairdresser jokes that he includes a disclaimer anytime anyone wants red that it probably won't stay for more than a few weeks. <g> I disagree with him that this is the case for everyone -- I've had quite good luck with reds over the years -- but I do recognize that red dyes just aren't as stable as other colors.
But obviously the color is not supposed to wash out in 48 hours and certainly not unevenly! So I'm glad you're going back -- what happened to you is clearly not what was supposed to happen.
BTW, you were smart to wait the 48 hours before washing it for the first time -- that's important for helping keep your color. Also, be sure to use a shampoo for color-treated hair. L'Oreal Color Vive is a good over-the-counter one, or I'm sure the salon would be happy to sell you one of their name-brands. Salons also sell shampoo that deposits color on your hair -- you can alternate it with your regular shampoo to help keep the red portions looking fresh.
Also, if you decide to keep coloring it, always, always just do the roots (assuming you are keeping the same color) and don't just put new dye over your whole head. You can have them pull it through the ends for the last few minutes to freshen up the rest of the color, but if you do your whole head each time, the dye builds up on the ends and the color gets more and more "muddy" over time.
Kathy (who has been having professional color done for the last 10-15 years. Going gray in your early 20's isn't a barrel of fun, but the "silver" lining
is that I've gotten to be everything from a blond to a brunette, with several years as a redhead in between.
)