Mzansi Solar bad service

we had a solar Geyser put in about 3 month ago by Mr van Heerden,we had trouble from day one ,no hot water,he came back and said he did not put the probe in far enough. We then had very hot water up to 99 deg.I phoned him and he said not to worry the system can cope with this. I then phone Geyser Wise who supp**** the unit for the read out e.g day ,temperature when the element come on and so on. They told me the temperature should not go so high it will damage the geyser.A little while later the display unit blow up. He came back and fitted a standby unit, this blow up as well after about 2 weeks,he then maintained it was because our voltage was up to 230 volt.I phoned Geyser Wise again and they said the unit can cope up to 250 volt. He the came back and took out 4 solar tubes ,which lowered the temperature,still no unit.After 5 days he came and installed the original unit which lasted 2 hours. When I sms him and said that he obviously did not install something properly. He then sms me saying he takes objections to my allegations and he is not coming back and he will send me an invoice,which he did ,for R 3300.00 .I now have an expensive geyser that is not working.HELP<br> Brigitte St