On site or with payment methods? credit card / paypal is typically 180 days.
On site. They can open a dispute at any time. The only thing is the time elapsed, circumstances of ban or loss and warranty given depends on if anything would be done.
If its a ban like I see on feedback, if its been a long time since the service was done its unlikely any action would taken because there would be no proof your actions caused ban, other users could have accessed the account or hacked on it.