Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
I recently purchased this product with $15 rebate. After more than one month, suddenly received an email saying that my rebate was denied because I sent the wrong UPC label. I think their rebate instruction is misleading - they actually need you to send a photocopy of the back of the card, instead of the packing label with UPC bar on it, though they have the SAME UPC label. So be very careful if you are expecting to get a rebate because you will see that they told you to send the ORIGINAL UPC label.
The other reason I rated this product 2 star is that I have some problem with it during transfering data to computer. It became disfunctioned completely and could not even be formatted. And I heard other people complained about similar problems. Maybe it won't be my choice for my next card.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: D: negative