Interesting domain problem

[blur]

I want to edit one of my client's DNS with this link:
http://www.netsol.com/cgi-bin/makechanges/domain.mod

They don't know how did they buy DOMAIN.COM

These are the contact mails for whois
Administrative Contact: admin@DOMAIN.COM
Technical Contact:contact@AHNET.NET

As you can see admin contact is same with domain name...

Neither me nor client doesn't know anything about technical contact.

And finally this is the fax number for whois: +90-212-2619398

Fax number has been changed 3 years ago...

What can i do?

Or could i do anything? :D :D :D