Non performance to replace burst solar geyser

My home's solar geyser geyser burst on 10 April 15. I reported to Nedbank insurance and Ad Hoc plumbers were appointed and did inspection on 11 Apr. It was found that geyser is still under warranty and WE geysers will replace the geyser. Then Millennium plumbers were appointed to replace geyser but only brought wrong geyser on 13 Apr. The plumber informed me that suppliers will be informed to get new solar geyser. Nedbank sent sms stating that if geyser is not replaced I should call them. Nothing happened up to date. I almost daily enquired from Nedbank insurance and WE geysers on progress and that nothing has been done. All the excuses was that manufacturer must supply the geyser and that they have no control over replacement of solar geyser. I contacted Millennium plumbers for assistance to speed up the process only to hear that apparently all plumbers struggle to get solar geysers replaced under warranty. 3 weeks has now passed without any possibility of getting a positive answer on when the geyser will be replaced. I'm now tired of the excuses and no warm water with winter approaching! Solar seems to be a waste of time and I never got a rebate for it! Please assist?