My blackberry curve 8520 keypad has stopped working?

ive had my blackberry for nearly a year now , at first the "a" went, not letting me use it but then putting it randomly into my sentences and ringing the* button. then my alt button stuck but after a few days was fine. all the time my middle button wud play up n i wud have to hold it down quite firmly for it to work. all of a sudden last week the left side of my keypad went with all the numbers on and when i pressed any of them it would type "w", a few hours after this my whole keypad went inclunding my menu,back and ringing button. i have taken the battery out and bk in etc. and it has not worked. now non of the buttons will work but i can scroll up and down. Can anyone help me?i have no insurance and can not afford a new phone. PLEASE HELP ME !?!?