用英语写一篇投诉信、要求如下：

To whom it may concern:
Have a good day and thanks for reading my letter.
This is what happened:
I bought a new digital camera in your shop few days ago, and after I back to home, I found that there were some scratches on the camera surface, and the color of a picture taken indoors is abnormal too.
I went back to the shop, I ask the shop assistant to change a new one or return my money back. The assistant pay no attention to what I said only for I lost the invoice.
I think consumer shall have the right to protect their own interests.
This is why I write this letter to you.
I hope you can give me a satisfactory answer.
waiting for your eary reply.
from: a aggrieved consumer in your shop
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