Amazon India — Voltage Stabilizer

I have purchased a voltage stabilizer from Amazon on 27-July-2021 for my new Hitachi 1.5 tone ac.
When AC got installed with the stabilizer it stopped working within 2 days.
I thought the Problem is with AC but when technician checked there was no Problem with AC
Problem was with the stabilizer because the display is showing the incorrect voltage so stabilizer damaged the PCB of the ac by providing the bad electricity.
3-4 times my AC got checked by Hitachi technicians Then I raised a complaint in Microtek after one-two months but AC didn't work not the Stabilizer.
This year i again started the Process with a refreshing mindset and Purchased new Voltas ac for the same place and sold the Hitachi ac.
But Stabilizer started same Problem with the Voltas ac as well. Today on 10-May-2022 I checked my Voltas ac by service center but they said Stabilizer is not sending the
required voltage to the AC and not working its totally in non working stage.
I am facing this Problem again and again and i cant change my AC every time. I need my Refund for the Piece and i am willing to return the Product.
Please Help here.