As playbunny shows, you have only two complainers - and only one of them has a bad rep.
From what you are saying, it seems you think the complaint from uzalla is the problem. You must have started a game with this player, even if no one moved, for Repbot to allow the complaint. As you have also complained about him, there is no doubt a game was started, even if it was unintentional.
The same is true with DisrealiGears [who has a deservedly good rep], you must have played him at some point. Uzalla I dont know, with a rep that bad, I wouldn't play him/her.
But then, uzalla has Experience: 24934, so that isnt someone with 0 + experience [whatever you mean by that].
Someone with little experience does make a smaller contribution to your rep - and even if their experience level changes, their original vote stays at what it was worth when they first made it.
My advice would be to sort out the problem with DisrealiGears, if he removes that complaint, you would have a positive rep again, as you have more vouchers than complainers - and it is that one that is hurting your rep overall. As I said, and his very positive rep shows, he is a nice player and a fair guy, you should be able to work that one out - unless you did something very bad
The other approach is to get more players to vouch, then your rep will become positive again.