So the plan for dispute resolution is to have a series of smart contracts ending up with a human arbitrator. So assuming everything goes well we have a single trustless hedged escrow smart contract that deals with payment. If there's a disagreement this gets escalated to a second smart contract, where the two parties can discuss and try to come to a resolution by themselves (say for example accepting 50% of initial payment for a worse than expected service.

Finally there's a third level of dispute resolution where a CanYa employee (Or a third party for later scaling) investigates the case to asses the evidence and make a judgement call. This will require serious scaling as the platform gets more and more transactions, however there's no way around this (Until we get super duper amazing AI solutions longer term  ). As a services marketplace offering everything from graphic design to smart contract deployment to plumbing to dog walking there's no way to automate the dispute resolution at the highest level. Hope this answers your question in detail!

The same as Uber or Airbnb, If you think that there has been an unfair judgement you'll be able to contact support to try and rectify this problem. Deleting feedback from your profile will be impossible without CanYa team input though - Otherwise the reputation system would be far to easy to game.