Nokia :: 5233 Can't Use Touch Button That Apper On Touch Screen

I just bought the new Nokia 5233 phone.Whenever the phone is locked and I set a alarm. There is no way i can stop the alaram other than to reset the alarm manually by alarms-> edit.

There will be two touch buttons that apper on the otuch screen. One to stop and other to snooze the alarm. Even If press them, it wont work. The alaram keeps ringing. I even tried clicking on the green button and the menu botton at the bottom. Still no use. I cant even unlock the phone. Only thing i can do is press the red button at the end, which will snooze the alarm. After this, I have to manually change the alarm time.

The same thing happens even with phone calls. I cannot use the touch button that apper on the touch screen. I have to use the green and red button at the bottom.These problem come into picture only if the phone is locked. Otherwise it works fine.