eBay account is locked, they ask to call them

[Isaac]

Hello Folks,

After I listed first item on my newly purchased aged eBay account they locked it.
Before creating a listing I spent a week for warming up the account to the new browser and the new IP by browsing different listings, sending messages, adding items in watching list etc.
Cannot reset the password now, they require calling them, but I do not know all the old information that they may ask.
1. Any ways to avoid such locks in the future?
2. How to unlock it?

[rsot]

Have you reached out to the seller of the account to you?

[Isaac]

If fact, my seller is a reseller and he also does not know what to do.