I'm willing to bet they tried to mount the tire from the wrong side of the wheel. On most any wheel there is an indented section normally on the narrow side of a staggered offset wheel close to the center section. Once the first bead is set over the rim it needs to drop into this indented area in order to allow enough slack for the second bead to pop over the rim. Trying to set a tire from the wrong side of the wheel stretches the bead too much, ruins the tire and beats the rim edges.
Get yourself a set of tire spoons from a cycle dealer. you will be able to mount/remove any tire you have without fuss or the hassel of dealing with the problem you just experience.
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