Carpetright and many others will have this on their invoice. In reality if you have a small problem and ring the store I can't imagine they will have an issue sending the fitter back, but if there where a bigger issue, the invoice gives them the power to riggle out of responsibility and leave it between you and the fitter to sort.
When they do come back to resolve or even beforehand, check they have used gripper in front on the fire place. Quite often the sub floor in front of this will be concrete and if the fitter was feeling lazy they may have just spray glued the carpet to the underlay in this area, which is why it is bubbling up.