If no answer is received, or a book, ask the firm to be returned.7.1) if the original is returned because the address is not valid, request a new address from the venture and the ship again.7.2) if that is not the answer, send again a second time by sending by mail a registration receipt.7.3) if does not receive an answer after sending a second time, and then use a different verification method, as follows:-Check the payment at a later date in the financial statements.-Check the proof of sale.
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