Have you received any email recently with the subject "100% Self Upgrade" perceived to be sent from GTB? Please neither do you honour the email nor click on the links inside. The email is a scam attempt pretending to be genuine but when you check the hyperlink, you will find that it redirects you to a fake URL.
For instance, the hyperlink with "Click the Link" will take you to [http://users2.jabry.com/gtbactiveservice01/Gtb.htm] which is not GTB's website.
Read the exact message below and beware!
Dear Customer,
This is to notify you of the present upgrading to enhance effective self security on your account.
Follow the link below to start the self security on your account.
Click the Link
We are sorry for any inconveniences.
Security Advisor
Guaranty Trust Bank © 2012.
Thank you for choosing Guaranty Trust Bank Plc.