What does this have to do with bitcoin requiring technical support?
Have you lost any bitcoins or do you need help with some kind of issue or have you just had unfamiliar numbers calling you because if so your thread is spam & nothing to do with bitcoin?
my ETH wallet has been stolen 1 year ago without knowing how the hacker got my PV key.
I changed the method of protection using 2FA so I am scaring if the hacker can pass 2FA
If your wallet ever gets stolen, you use the seed word / priv key elsewhere and move all funds to a new one. That is basic common sense. 2fa is garbage, as long as the wallet has some decent password it will delay the thief long enough for you to do this. 2fa can actually give them another means of entry...