[Disappointed seller]

I have bad experience of fiverr.
I got order invitation from client and did not received notification on time due to error may be or fiverr server.
Than client cancel order and provide nagtive feedbacks. I m very confused and upset by this policy of fiver.
Kindly remove those feedback that I not deserve.
And also penality of $4 usd. Really fiverr
Provide me guide please.