Poor Bank Serivce provider Aluwani's Maintecon

I've logged a call for no ho****er connection on 8 July 2015. Aluwani's maintecon was dispached and installed a Geyser return valve & Thermostat. After initial work done I gain experienced hot water problems and Aluwani's Maintecon installed a second thermostat on Thursaday 23 June 2015. On Saturday 25 June 2015 I againn experienced no hot water, Aluwani's maintecon was dispatched and installed a 3rd Thermostat. Yesterday 27 June 2015 I again had no hot water and had to specifically instruct Standard Bank Insurance to dispach another service provider and not Alunwani. The other service provider ariived on site today and upon inspection adviced that the geyser had to be replaced.This indicates that Aluwani's Maintecon does not have the neccessary competence and and customer service orientation to correctly identify a problem and fix it the first time around.