Business that likes to make money but when there is issues walk away from the guarantee!

So i bought a Pentair Chlorinator for over 10k and had it installed in OCT 22. In Dec it stopped working Infinity pools then replaced this unit since it have a 1 year Guarantee. In Feb 23 it stopped working again, which is the second new unit which one can assume should carry another year guarantee since it is new. Now the blame game starts whereby Infinity blame the manufacturer Pentair? Pentair blames load shedding, when i have a off grid solar system and load shedding and power spikes don't effect us? My biggest frustration is that Infinity sells products and when there is an issue they walk away and refer you to the manufacturer? Surely this is not normal? If i sell the product surely i sort out the warranty? I did not buy this from the manufacturer i bought it from them, how do they just walk away from this? Anyway i have been trying to resolve this since Feb, best is i am talking to the receptionist as the owner who made the money with my purchase has now disappeared! If you use them get ready for disappointment!