I would like to get the picture of the can and the inside surface of the can that the customer claimed there are plenty of rust.
At this stage there is too little information from the customer to identify the problem and evaluate risk on this issue.
11. At this stage we could not find any deviation to cause rust inside the can. Normally inside the can is under vacuum therefore it should not and could not have rust therefore we would like to see the can or at least having the photo of the can.