bank service and terrible noline banking facility

i am furious with FNB and their nonsense online banking facility, i registered for online banking a while ago and didnt use the facility for a while, and now that i try to log in, I can nolonger remember the log in details so I only attempt once to log in and than i decide to reset my log in details and i keep getting and error has occurred and I try several time with no luck than i go to the branch where they also fail to make the changes as it keeps saying no data returned, I can not reset or re-register im just stuck and so is the rest of my life, cant make any payments because the online banking is messed up, what am i support to do now?