Kent RO — Give my money back

Kent was not working (tds above 250) and hence i booked kent service. Technician came and charged 9k and still there was no reduction in TDS. We called him again and he came and charged 3k again. Yes you are reading it correct we became fool by spening 12k just to repair kent. It means innitial 9k is a fraud.
We would get new RO system in less than this price. I am able to see other good new RO systems around 8k.
They took 3 days to visit our home after booking. It affected my family health also.
Pls give back my 9k .