Since you cant login with your unique email and there are more xeek's, i think this could be the problem
chat transcript:
xxxxxxx@web.de: so you cannot delete my gamesas forum account?
xxxxxxx@web.de: maybe this would help
Sarah: Tell me the name
Sarah: I can try
xxxxxxx@web.de: xeek is the accountname
Sarah: I am sorry but this name is associated with a lots of accounts, so I cannot delete it