My car wont start?

I have vauxhall corsa auto 96reg, with recent climate conditions,i tried to start but it didnt,breakdown guy said that engine is not spinninmg,there migt be cambelt come off,and it would cost me lot,as it is old one not to spend that lot but to scrap it.
Can any one suggest me what shpould i do at this time,it has been running well all the time.i really dont want to spend lot of money on it aswell as i dont want to scarp it for nothing.
thank you