Unfortunately it can happen. Here is what you can do:
The first thing you should do is take the time to analyse the feedback and understand where things went wrong. You may wish to contact the reviewer to try and rectify the situation.
To help improve your overall rating the best thing you can do is do more great work for candidates and clients and get more positive reviews.
If you feel you have been left a negative review unjustly or the review is particularly malicious in nature you can contact us to request for it to be taken down.
Only in exceptional circumstances or where it can be proven that a review is unjust will we agree to take it down. We will not take a review down simply because it is negative.