tell them that the quality of work is unacceptable. They need to either re do it the right way or give you your money back. That does not look good at all. Dont go in all pissed off, just try to explain it professionally and see what they are willing to do to make it right. Explain to them what you want it to look like. Tell them that it should be centered, not rubbing on anything and if you want them flush mounted with the rear bumper area or how far you want them sticking out. Stay calm and see what they are willing to do to make the situation right. This way you both know what you expect and what the finished product should look like.