Ok, I did Backup wallet.dat and will run the command as said.
Another doubt in the case, the value without confirmation of the first transaction there from the beginning of February will go back to my Wallet and the latter that made paying very low shipping fee according to the amount I wanted to send everyone will return to Wallet?
NOTE: I apologize for these questions, but as this never happens, and if all goes well, if it happens again I will know how to solve.
Any transaction that you made using the client and is unconfirmed will be dropped from the mempool and you can spend it to the respective address again. Ensure that the address is still valid on the site. Some services do not honor deposits to an address after a specific timeframe.
Already ran the command and now the customer is re-scanning the wallet. Any questions post here. After that I have to wait 72 hours you said, right?