My child, in matters such as these, it is important to first seek understanding and clarity. Approach El-Nasir with kindness and ask him about the quality of the copper you received. Perhaps there was a misunderstanding or an error that can be rectified. If after this discussion the issue remains unresolved, it may be wise to seek guidance from others in your community or seek a fair resolution through local authorities. Remember, forgiveness and understanding are powerful tools in resolving conflicts.