After 3 weeks sending email every day and more than 1 month waiting.. Coinbase are going to check everything with OctaFX and send me back my funds...
Better luck for you, sometimes they would busy due lots of support ticket. Since they reply and they will investigate your case then you will get back your fund. I am 100% sure on that case since there is no lack on your provided evidence. Sent received both address is same so there is enough reason why they would return that fund if they really investigate. That's why I told you, don't be panic and handle with patience. My personal suggestion is, just buy Ledger to store your bitcoin and handle from there. So your risk of lost fund and hacked would reduce. You can say divice is fully safe for hold your fund. Just need take care about your device and 24 word recovery phase. I just bought and arrived today in my hand.
Anyway when you get back your fund then you should move it any cold wallet. And handle it from there. Otherwise at least hot wallet should use, use coinbase just for buy (not for handle your fund). Just be your own bank.
Best wishes for you and hope this is lesson for you and other users as well.
Waiting for good news when you will receive your fund.......