While thats true, the service was still completed on the account. The 10 mil is compensation for ruining it. If it were to be banned, it would have been a differet story. As for the feedback, as Chris pointed out, negative are for scam related issues only. If you're unsatisfied with the service (Which you are), you can leave him a neutral feedback and that wont be removed.
Dispute closed, and the negative feedback will be removed.