Since you don't give any more details and also do not reply here or via PM there is no possibility to investigate this. I appreciate the input but with this low effort there is simply no use in it.
This user is known for baseless accusations so don't expect him providing any info why he thinks that account changed hands. For him its enough to someone change the email address (like in this case) to think that account has been sold, while people can do that for myriad of reasons.