(P.S. in the past several days, there was a notification in freebitco.in site that the old BTC addresses shall no longer be used, and that new deposits should be made on the new P2SH addresses, so i had used this address for the deposit by clicking on the Deposit -> QR scan. Unfortunately i did not make a screenshot of this, and now this notification is no longer there, and the deposit address has returned back to the previous one, so i feel that i have been scammed and my money has been stolen. I really hope this is not the case)
Are the two of you absolutely sure that the notification came from a legitimate freebitco.in site and not from some phishing site? Or maybe your computer is infected with some kind of malware?
I have never seen such a notification on my account or in an email from FreeBitcoin and all the old deposit addresses still work, at least that's what it says on my account.
Your previously generated bitcoin addresses are listed below. Any deposits sent to these addresses will also be credited to your FreeBitco.in account after 1 confirmation.
And clicking "NEW DEPOSIT ADDRESS" still gives a legacy address starting with 1, not 3.