BAD Service - Duratherm Geyers warranty Claim

On the 26th May 20 my burst geysers was reported to Duratherm Geysers by PBE Trading as the geyser is still under warranty, to date we have had no joy from Duratherm they are not answering their phones nor the emails, we had the some problem in November 2019 it took 3 weeks to have the geyser replace, now it has burst for the 2nd time, Have been trying to get hold of Duratherm since 26th May and still no joy, have contacted the insurance company ( SA Home Loans) they told me that they cannot help as this is a warranty claim with the manufacture and they are not allowed to get involved, but they can take our monthly payment every month with a smile, but should we miss a payment our insurance will properly not hesitate to cancelled the insurance