Acer India — acer nitro 5 ssd upgrade charged even though in warranty

Address:	Hyderabad, Andhra Pradesh, 500072
Website:	www.acer.com/ac/en/IN/content/home

I've purchased acer nitro 5 ryzen laptop with an upgradable m.2 ssd slot from flipkart.
Flipkart link: acer nitro 5 ryzen 5 quad core - (8 gb/1 tb hdd/windows 10 home/4 gb graphics) an515-42 gaming laptop
http://dl.flipkart.com/dl/acer-nitro-5-ryzen-quad-core-8-gb-1-tb-hdd-windows-10-home-4-gb-graphics-an5...⇄

I've confirmed with acer customer support on chat if i can install an ssd by myself by removing the warranty sticker.
They said, no i can't and doing so voids my warranty. Instead i need to visit acer service center for doing that and as my laptop is in warranty, they'll do it for free as i shouldn't be doing it (Consider installing an ssd in a laptop is not a talent. A kid can do it)
As suggested, i've contacted the service center and they told they'll charge me as the ssd is not acer's and void my warranty for installing a non-acer component.
Nowhere is it written that, the laptop's dedicated empty ssd slot is only to be upgraded by acer's ssd. Not even in terms and conditions.

So i went back to acer customer support. Told them the situation, they said sorry for the inconvenience that's acer's rule!!!
And when i told them that they are the one's who told me installing an ssd won't void my warranty and it's free, they just simply told me "i apologise for that"
I don't need apology. I've spent 55k on laptop and ssd.
What do i do now?
Acer service center clarification
"i can install the ssd by myself without damaging other components, which will not void my warranty. But i shouldn't remove the warranty sticker"
Can any of the tech giants tell me how do i remove the back panel without removing the last screw which is covered by acer india warranty sticker?
What do i do now?
Acer didn't provide this information before anywhere.
I want to sue acer for this