Back buttons not working & taking pictures automatically

hi my 700d is 1.5 years old japan made, in good condition with no liquid damage and fall incidents. now suddenly my camera's back buttons stopped working properly,including shutter button also.i removed battery and memory card and kept for two days,done reset ,and updated the firmware to1.1.4 also .still my problem is not solved can you suggest a fix to this.i am from saudi arabia.here we wont get canon service centers easily.

regards

Jeo Varghese

jeovarghese007@gmail.com