User Activity

the feedback left by custumer can be seen in is profile but when i check my profile it's not there and more that one is missing.
a person bought 10 of the same item i have for sale. i checker is feedback he have multiple transaction but i cant see the item that he bought even those made less that a month ago. i try to investigate a little more and the address provided is not a...
i was hoping for at less 1% reduction but nope still 10%. does i get a credit at the end of the month or something?
can someone who buy a item but didn't pay me can still leave negative feedback?i got 100% feedback score I want to leave him a negative feedback but i dont think it worth loosing my 100% score for that.
i have item worth 2000$ for salein my add i clearly said that i would not sell to people with 0 (zero) feedback score. but a guy with 0 buy my item anyway he dint pay for it yet. what i do now ?