Don't know what are you trying to do but here is a summary

You just asked if you could give MNX as collateral and at the same time you are looking to sell them but can't as there is no exchange available which means if somehow someone buys approves your loan then he has to wait to get it listed as it was clear from your post that you are not looking to repay the loan and going to default the loan, as a result, he has to leave a rating and others too, to mark your account as scammer. So, Vod marked it before the scam that this person is likely to scam or has intentions to scam someone in future. so, trade with caution. I think nothing is wrong in this and it's human nature to protest against things that are not in there favor.
That's all

You should start from newbie again or keep asking him to remove the feedback which is not possible anyhow.
The choice is yours.