Terrible Service from Nedbank Insurance

I lodged a claim for geyser repair, my Policy number is : *** and order No ***, the plumber came to repair the geyser called Buster Plumbing Tel ***, on 18 July 2025, they did not install a new geyser but worked on the old geyser and were unable to repair it,(contact details ***) but I paid excess fee of 500, which I have a receipt to prove, they say they will contact someone to come and fix the wiring, on Monday 21 July, 2025, the guy( contact details ***) came and was unable to fix the geyser , but he fiddle with my electricity box, and when i came yesterday all the plugs were not working, I slept on a dark house, nothing working, I am disappointed as this is a first insurance claim that i made after 17 years of paying insurance premiums, I want Nedbank to ask their bogus plumbers to bring my 500 back and also fix the electricity that the fiddle, i want everything to be working, and am wondering why Nedbank Insurance use unprofessional plumbers who are unable to do the work to their clients, instead of fixing, they unable to fix but break