Unless the S-Max is something different to every other Ford, the studs should be removable, usually pressed in with a spline and can be hammered out once the hub assembly is removed. Tell them they stripped it, they should replace it, they'll soon find a way of removing the stud (cost circa £5) and pressing/hammering a new one in. If they don't want to play then take it to an independant garage with more skilled mechanics.
Even if what they say is true, that the stud is not removable, then a hub should be available from a motor factors for a lot less than the Ford price.
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