I had a new quartz countertop installed, and everything looked very nice. But one day washing the sink I saw that some water was getting between the sink and counter top. I thought, no problem, I'll just get some silicone. But in the process I saw that one corner of the sink had this fiberglass "junction" (my guess is that the screw hole got ripped out and instead of fixing that they just glued the corner using fiberglass). This is a new job, and it has a year warranty, and everything seems to be holding fine (I had actually filled up the whole sink with water while I was doing dishes and it seemed to hold up?). But it seems kinda like a botched job. Is this an acceptable repair/installation? Or should I try to request a more "clean" repair/installation?
Edit: added the "normal" fastener on one of the other corners (this is looking at the bottom just in case that isn't clear)