Wow.
This is a very bad situation, as far as this 
dealer's practices are concerned. Looking at the 
feedback, it is very clear to see that you are not 
alone. 

One wouldn't think that anyone would damage their 
reputation for $40. But, this might have been one 
time to believe what is being said by others in 
feedback. That is a lot of negatives (24) and 
neutrals (30), almost all with a similar 
complaint. Many people seem to have paid for their 
items and received nothing, some even state that 
they resold the cels. The seller seems to state 
each time that they didn't get their money and 
that the person did not email them. Far too many 
times than is normal, even in unusual situations.
  
Even many of the positives are not particularly 
positive. The ratio of unhappy customers to 
satisfied ones is far too high for comfort.

It looks like there is probably more than one 
person doing business under this name. One may be 
perfectly decent, and another that is extremely 
sloppy and makes excuses (and blames the 
customers) for their own mistakes. In fact, I 
would be willing to guess that the person who is a 
good dealer (judging by the fact that they have 
over 500 happy customers, they do it right fairly 
often) is not aware of the problem you are having. 
Perhaps getting their user information and trying 
a phone call would help? Or have you done that 
already?