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A person reads these and a person answers them. If you are appealing a decision about your account, or reporting a contractor, this is the right place.
Before you write
If your job has been accepted, the fastest answer is usually the contractor themselves — you have each other's details, and we are not part of the arrangement between you.
If nobody has accepted your job, that is most likely coverage rather than anything wrong. We are new, and thin in most places. Write anyway if you would like us to look.