I can not turn off VoiceOver on iPhone 4S

How can I turn off VoiceOver and get back to normal ?!

As I follow the instructions how to turn off 'VoiceOver' in Setting on my iPhone, however VoiceOver icon get back on quickly after double click... (haven't upgrade iOS 8.1.1 yet)

-Tried to do double click 'Voiceover' icon in Setting, but doesn't off and switch on back quickly..

-Done press 'Home' button 3 times quickly, but Top page shows up later..

-Done turn off the phone, the VoiceOver shows up with passcode screen..

What else I can do for turning off the annoying voice? I need to fix this situation asasp! Pls advise me a smooth solution.

Thanks,