Heat tech does not follow up and follow through.

My geyser was under warranty with heat tech geysers . I had lodged a complaint to ask for the geyser to be changed which they said would be done within 24 hours . After 24 hours there was still no plumber and my roof began to leak that night. I called for the plumbers who replaced the geyser. 2 days later the geyser began to trip. I then called asking heat tech to get the plumbers to come back they called the next morning and because they could not access the complex without a remote we asked them to come back at 3pm which they agreed to . I lodged a complaint 2 days later as the plumbers did not return . When I called heat tech for now the third time the lady who answered kept cutting me off every time I tried to complete my story by asking me questions. When I asked her if she was going to listen and let me finish she then puts me on hold,by this time my airtime has been fi wished and I have been switching my geyser on and off to avoid it tripping or blowing whilst having three kids in my house for the entire week. I am not impressed with Heat Techs service at all .