Refusal to assist paying client

We have purchased a Solar kit and installed the unit on 02/12/22. We switched on this invertor unit, it was working but as soon as the loadshedding started it completely cut out. I reported this to Nicki January so called manager at Protonon on 08/12/2022 and yet they refuse to replace this unit or to refund the money. My client is totally disgusted as they had to pay for us to purchase this kit from the supplier Proton. Peter to Requested to see the CEO and yet Ms January was extremely rude and just said she is the manager and refused to assist me further. I need your assistance from Hello Peter to do an investigation regarding this matter.