Service? What's that?

At the beginning of April, Sun Africa was contacted to report a leaking geyser. On 2nd April, a serviceman came to site, but was unable to stop the leak. He promised to return on 7th April, after the long weekend. In spite of phone calls and Internet messages, no further contact has been made with me. Our local Estate handyman, and an external plumber have visited the site, but are unable to carry out any repairs due to the fact that the geyser is under guarantee. The guarantee on the geyser still has 2 years to run, and needs to be replaced. Mr du Preez, when he contacted the Estate Manager, following a call from the Estate office, claimed that the delay is due to him moving premises, but almost one month after the first contact, no further sign of Mr du Preez, or his serviceman have been seen. Although the most expensive system was installed, each time a fault has been reported, service is impossible to obtain. His email address is [Email Removed] His cellular number is ***