Report you findings to Support so they can monitor the account.
Sometimes account users, do pass on their account to RL friends to take over if they have left Achat and that could be a possibility.
Some account users like to play silly games too.
However, my advice is to pass on any suspicions to the Achat Gods so they can monitor the situation & if necessary close the account till the original user contacts them.
May I remind members never to pass out personal details, no matter what the circumstances, no matter what the sob story, and if you believe your account to be compromised to inform Support and change any passwords immediately.