Wow, that's a lot of frustration on a fairly new vehicle.
I'm not sure I can tackle every item at once, but let's start from the beginning: Why did they recommend you change the fuel filter? That vehicle is not equipped with an easily serviceable fuel filter. It is part of the fuel pump assembly and Hyundai does not list a mileage recommendation for it's replacement. In other words, it should not have been replaced unless the fuel pump was going out.
The fuel pump went out after changing the fuel filter? I would assume that their reasoning for changing the fuel filter would be to make the fuel pump last longer (again I would never change the fuel filter and not the whole pump on this model). If the pump went out right after the filter, I would assume it was because the filter and pump were installed incorrectly the first time.
The headlight and running light could just be a normal wear and tear type item.
Reverse sensors going bad is very uncommon.
The fuse blowing indicates a short, maybe caused by the repairs to other electrical systems. And the door buttons going bad? That is pretty rare also.
The chime, the map light, etc...it all sounds like someone made some major mistakes while fixing the electrical problems. I would assume it's a break in the wiring in the door jam or a contact in the ignition switch.