I would have to say that I was less than pleased when I ordered a 4 Gig Ipod mini that did not work!  I was so disappointed, not just because the item didn't work, but because of the information that Fortunaenterprises gave that was misleading on how to correct an error on the ipod.  I was very wary, and didn't listen to my gut instinct, which was my first mistatke.  I also assumed that they, like most EXCELLENT ebay sellers would just correct the problem with no fuss.  I was wrong on both accounts, but was still able to "somewhat" resolve my issues..In the end, I had to go over and over my story, and finally was able to get to a supervisor.., now I am not going to say that this was an easy task, but I did have OVER a $150 at stake so it was worth it.  At first the response was,"no way" then I explained to her that I was just trying to give Fortuna an opportunity that I had noticed that alot of other buyers didn't before leaving negative feedback.  That actually softened the blow quite a bit.  I then explained, that although the product was,"sold as is" by Fortunat giving explicit instructions on how to correct the problem with the unit they were taking responsibility for me being able to correct the problem.  After much deliberation, and negotiations..the supervisor stated that she would give me $75 of my purchase.. I agreed to this, because it was my fault for taking the chance, and their fault for mis leading.. I considered this a $75 dollar lesson.. At the end of the coversation, I apologized several times for being so upset, and thanked her for her professionalism... When she sent over the email, with the $75 credit, she had actually UPed the amount to $100., So all was not lost... in this case I caught more $$$ with honey than vinegar!

So this guide is to help those that are dealing with some of those very big wholesale ware houses...

1. Read the instructions for returns very carefully
2. Always review the feedback that was left by both the buyers as well as the sellers... (you would be surprised at the information that you can find just by reading)
3. Use the buyer feedback of others to help you..in my case I saw that the responses from fortuna was often that the buyer had NEVER made the attempt to email them or call them.  I used that very comment when I called and stated that I didn't want to be like all of those other "bad ebayers"
4. Remember the old adage,"you catch more flies with honey than vinegar" Try to keep your patience even though they it will be difficult, you must let whomever you are speaking with feel as though you are there friend, and not yelling at them!  I repeatidly said to the supervisor, and the original customer service person, that I was not trying to kill the messenger, and that I understood their policies, but what if THEY had lost that much money, and put them in my place.
5. Never swear, and that was the hardest thing for me! But You are not going to get anywhere if they are still remembering the awful word you just used to speak with them. 
6. Thank them for the help that they have given, even if it is less that what you feel you should get back, you have to remember, that anytime you are buying from a company like this you are taking a risk, and you should not spend more money than you can afford to lose.  Losing money is difficult, but in using ebay we are all somewhat trying to get something for nothing, and unfortunately we have to remember sometimes you get what you pay for or you get nothing at all! Hope this helps!