It is very difficult to make the link between the requests for refunds - which are given a number - and the refunds which are given another number. On the other hand, the amount from which one must send paper proofs and not scanned documents is low. When you know that with Argentina the postal delay can be up to 6 weeks when the mail does not get lost... the solution is not satisfactory at all. Finally, as I was able to see during a recent misunderstanding (not resolved) for which I am partly responsible, the responses to messages and requests for reimbursement are terse and Humanis behaves like the CFE mailbox. In short, I am not very satisfied.