I too doubt it failed, i suspect it was poorly fitted or the retaining bolt(s) left off/loose, but proving that is going to be impossible now so probably best not start suggesting such things.
Fortunately the garage supplied and fitted the part so it's down to them to sort the car out, you'll have to be firm but polite here.
This is a prime example of the headaches involved if the customer provides parts for the garage to fit, all labour costs would fall on the customer and then the part supplier will blame the fitting garage, and the customer is piggy in the middle, all for saving a few guid on parts mark up, thankfully the OP didn't do this.
Edited by gordonbennet on 17/04/2017 at 11:16
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