If I don't pay back, will they reverse transactions I made to others pay to recover the balance?
No, they aren't going to punish other merchants for your debt. Like everyone else has said, they'll first try charging your backup payment methods before sending your debt to a collections agency.
The linked bank account is closed, will they really try to collect for just $300?
I'm assuming it would be better to take no chances and just pay it off.
They'd refer it to collections for $30. It's automated. They would rather get $200 from you (or whatever % the collection agency doesn't take) than nothing at all. In the $30 example they'd rather get $20 than nothing at all.
get a legal advice about how to fight the wrong debt may be lawyer can give good advice but sine the amout is low there is not much to worry about unless you add ssn in which they might effect your score rest everything is fine my stealth account is negative 800$ nothing happen
get a legal advice about how to fight the wrong debt may be lawyer can give good advice but sine the amout is low there is not much to worry about unless you add ssn in which they might effect your score rest everything is fine my stealth account is negative 800$ nothing happen