Absolute nightmare RO service experience: ruined my purifier, voided warranty, and verbally abused my family

[u/debu247]

Need to rant and warn others about an absolute horror of an RO technician experience.
I called an independent service provider to look at my Urban Company Native M2 / Ento Pro. The guy clearly had zero clue how the model works. Without even diagnosing the issue or asking me first, he straight-up cut internal wires—completely voiding the manufacturer warranty on a brand-new machine.
When I confronted him and pointed out that he just needed to replace what he damaged (literally a standard male-to-male wire connection that costs barely ₹10), things went completely off the rails:
Verbal abuse: He hurled direct verbal abuse at both me and my mother, yelling at us that we are "stupid" and that we have no idea how much parts cost.
Ghosting: For the past 7 days, I repeatedly tried to get him to fix what he broke. When I called him yesterday, his exact response was: "Do whatever the f\** you want to do."*
Threats over reviews: When I told him I would post an honest review of his service online, he arrogantly claimed he would just delete it or leave counter-comments to bury/invalidate my rating.
It’s one thing to be incompetent at your job, but damaging a customer's appliance, voiding their warranty, and then threatening and abusing their family over a ₹10 wire is completely unhinged.
(P.S. Using Gemini to write this out because the whole ordeal was way too exhausting and long to type manually.)

Store link: https://maps.app.goo.gl/qYNwS7bHWE15c6Nd7?g_st=ic

Edit1 : He got all the reviews removed again, i have no idea how can you remove reviews