head gasket and timing belt on 2000 Nissan Quest

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was at a red light when the car said it was head gasket and tining after having car for 18 days and not touching it,they say its not worth fixing ,it will need a new motor.even after saying that no other damage to car because it was not moving at the it fixable or no worth they had me buy the parts already.
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Sounds like the valves hit the pistons when the timing belt broke and if probably isn't worth putting a new engine in, Return the parts while they are returnable.
had gasket and belt fixed and car is running other problems found other then changing some other belts.thanks