RE: dell inspiron 15-3552 not charging, getting mixed responses
" but the place that I usually go to for this kinda stuff was persistent about this being a charger issue".
Does the LED light up on the AC adapter ? If yes, then I suggest you check metal tip at the end of adapter. If metal tip is bent then you must center it with a small screw driver.
How to resolve Battery and AC adapter issues on my Dell computer?