Bank & Supplier de*****ing customers with old Geysers.....what a shocker!!!!!!!!!!

I had a claim back in 2022 for a burst geyser claim approved and had option of using own supplier or cash back (opted for cash back) and we authorised the SP that was appointed by standard bank to replace the geyser as they had one. Me trusting standard bank, we authorised the standard plumber to replace the geyser, the job was done and we had hot water. Fast forward, I know have a claim 25/040348...booom, standard bank SP installed an old geyser as it was supposed to be under warranty (5 years - fair enuf) but know the issue is the SP that installed an old geyser which I am stuck due to this (who still has paper work for 3 years back???????) , we don't have invoice and only have proof of replacement of geyser...supplier advised that they deal with the standard bank for geyser replacement confirmation...who am i to question the plumber as there was hot water, we didn't ask as we trust the insurer...now i don't have hot water because of *****ulent suppliers contracted to standard bank. Its quite shocking to imagine how many more customers have been de*****ed as once a geyser is replaced, no one goes to the roof to check the validity of the geyser as we trust that supplier is vetted through the bank (I was a plumber i would know the steps to follow but hey....I'm not one but expected to have knowledge of the vetting)