When I entered the IP you provided into a whois search I got the following info. I don't think there's a whole lot we can do to help. They are not gaining access, just guessing at passwords with your account name test.
69.64.58.133
Record Type: IP Address
OrgName: Server4You Inc.
OrgID: SERVE-6
Address: 710 North Tucker Blvd
Address: Suite 610
City: St. Louis
StateProv: MO
PostalCode: 63101
Country: US
NetRange: 69.64.32.0 - 69.64.63.255
CIDR: 69.64.32.0/19
NetName: S4Y1-NET
NetHandle: NET-69-64-32-0-1
Parent: NET-69-0-0-0-0
NetType: Direct Allocation
NameServer: NS1.NAMESERVERSERVICE.COM
NameServer: NS2.NAMESERVERSERVICE.COM
Comment:
http://www.server4you.com
RegDate: 2003-07-30
Updated: 2004-04-29
RAbuseHandle: SWI19-ARIN
RAbuseName: Wintz, Sascha
RAbusePhone: +1-866-342-5749
RAbuseEmail:
RNOCHandle: SWI19-ARIN
RNOCName: Wintz, Sascha
RNOCPhone: +1-866-342-5749
RNOCEmail:
RTechHandle: SWI19-ARIN
RTechName: Wintz, Sascha
RTechPhone: +1-866-342-5749
RTechEmail:
OrgAbuseHandle: ABUSE260-ARIN
OrgAbuseName: Abuse Contact
OrgAbusePhone: +1-314-754-0420
OrgAbuseEmail:
OrgNOCHandle: NOC1222-ARIN
OrgNOCName: Network Operations Center
OrgNOCPhone: +1-314-754-0420
OrgNOCEmail:
OrgTechHandle: SWI19-ARIN
OrgTechName: Wintz, Sascha
OrgTechPhone: +1-866-342-5749
OrgTechEmail: