There is nobody on here selling currently that is under investigation - investigation is swift as is the retribution.
We tend to get involved if ~ you for example, ask us to help as I (again for example, I sell nothing) sold you a line and it's gone down the swanky.
Admin will contact me by PM and ask is there a problem my end and am I aware of your problem. We will invite you to the PM and get it sorted quickly - admin will tend to test "my" line and if theres no problem, it's your end. If theres an obvious problem, they will invite me to fix it, or feck off.
We have had lines from several long term sellers sitting aside, so if anyone questioned a, b, or c's line, we could quickly test on our own machines ~ but they've all run out now, as I have gotten too lazy to chase them to extend them.