Is it the cupboard OR the plinth that has been damaged?
The reason the strip has come off will be because the chipboard on which it has been attached to will have absorbed water and expanded.
If its the plinth you could fit a new plinth. If its the cupboard then either you stump up for a new cupboard or try to get a new strip ironed on.
That said, i have seen no end of pre-existing damage to chipboard units in clients kitchens so are you quite, quite, 110% absolutly sure that your staff have caused this damage?
Stephen