I agree rework in our side for your suggestion.But charge double for the sorting cost is not reasonable
We have do our best to solve this issue and give you quickly feedback after received the complain.But remove the burr by knife may have the risk for the suspect parts before corrective action.
Of cuz,I am very sorry for the repeat issue happened on your side.But we have the corrective action and contact with your team immediately in order to solve the repeat issue.right?