XPS 15 Color issue - Hardware or Software?

Hey all, 

I'd love to get your opinions on whether an Issue I've been having is hardware/software related and what the issue could be.

A couple of months ago I suddenly noticed that the colours on my laptop had gone weird - particularly the reds/oranges were duller and darker than they should be. As I do a lot of Photoshop work and photography, I need my colours to be 100%

I spoke to several remote engineers who took me through various 'tests'- though they were hard to actually gage for accuracy. For example, one takes you to a screen with flashing blue, green, red, etc. and I was asked to say if the colours looked normal. As previously stated - none of my colours has completely changed, they were just duller/ 'not quite right' so without knowing exactly what the control test colour shades were MEANT to be it was hard to say if they looked wrong- red is still red, green is still green...

I noticed my colours were very different from those on my partners Mac too and any other screen - though obviously different screens can be different anyway. Eventually, I was told to connect my laptop to my tv and see if they were changed on the tv though. They were slightly brighter and more saturated ( which I told the engineer)- who, based on that test, decided it was a hardware issue and I needed a new screen ( although I'd previously been told numerous times that each screen is different so colours would look different on different screens. and my tv is in general, lighter and brighter...) so, desperately, I said okay.

In the end an engineer came to my house and fitted a new screen - no change! After telling him I couldn't afford a new screen for no reason he decided to mess around with my colour profile settings a bit and the colours got way better. He then advised I call the company to ask about a partial-refund or something since he'd already 'logged that the screen has been changed', so wouldn't remove it again.

To cut a long story short - after A LONG conversation with a remote engineer so intent on proving that the screen was necessary that he somehow messed up the colours again. I was left stuck. the 'fix' the in-person engineer did no longer works and the colours remained broken.

Several phone calls later and I was told that the only remaining option is to factory reset of the laptop ( but that the screen was definitely necessary - regardless of the fact my issue wasn't fixed by it). That hasn't yet happened... 

Then a couple of nights ago I was working on my laptop when the screen suddenly went black, flickered on and off a few times, and then when it came back the colours are now super bright and saturated - but now TOO saturated ( particularly reds and oranges again). I checked all the usual settings - nothing has changed, did a calibration - no luck. 

This furthers my belief that the issue was never hardware or required a new screen. I'd love to know other opinions though and if anyone has had anything similar and has a fix? 

The incorrect colours are affecting my livelihood and I'm a broke student so I can't afford to buy a new laptop (or spend money on unnecessary parts.)