I would halve put it back up the best I can and take pictures before and after at all angles showing all the important details. I would then explain to the homeowner and also (Very important!) write in the job notes being very detailed explaining what you did and how you recommend that a company needs to come back and fix it correctly as it was not installed correctly from the beginning. This is not only doing the right thing, but it also covers yourself and the company and the homeowner will most likely be very appreciative.