Leaking Geyser from Solar panel

Tasol installed a solar panel and geyser after convincing me for a better geyser and flatplate combination \Solartherm Geyser"I picked up from my water and lights account that my consumption went up dramatically. I search all existing pipes and fixtures for the problem but not the geyser as it was brand new. Could not find a leak. The following month the same trend. Then afterwards been notified by a guest visiting that the geyser leaks. I reported immediately to TASOL Alberton. They sent someone to repair but was blaming on the geyser manufacturer product (Duratherm itself) Duratherm sent plumbers out to replace the nylon connector (Teda fitting) with a brass fitting and the leak stopped. Now I sit with the huge bill for water that leak from the geyser. Durtherm blame Tasol and Tasol stop communicating after several emails in who is responsible for my water losses and huge bill. <br> Please make sure who you do select for a solar geyser installation and from which supplier """