As McCune wrote "I contacted this user without a Sythe account." therefore this recovery responsibility does not apply to me.
I would have helped from my good heart if he had confronted me in a nicer way.
The account ad he linked to is not the one he bought. This is the correct one. Click Here
There was no ToS being agreed on at sale.
Edit: On the bottow of the ad it states
"I will not be held responsible for any mutes or bans that occurs on the account after the sale.
Once the account had been given to you, I will not refund any payments."