Absolutely hopeless after sales service.

I recently purchased an under counter slimline instant hot water boiler from builders warehouse. It is an Ariston Aures model. In anticipation of a complicated installation I asked the salesman at builders for contact details for Ariston,so that they could recommend an installer. I was given a cell/whats app number for customer service,which i messaged to ask for names of installers in Cape Town. The first one they gave me didnt reply to my messages for over a week, the second quoted to install,came out on site,had never see this model before,and could not install it. Eventually I got my own plumber to do the job. After installation the unit did not work. I gave my plumber the help line to call and get assistance, which he tried,but it was never answered. Eventually I messaged them and they made an effort to get hold of my plumber. For the record,the instructions supp**** with this item are incorrect,they refer to reset switches which do not exist..... They could not help my plumber,nd said they need to send th epictures of the installation to their manager..who never called the plumber back. Again I had to get involved,and managed to convince them to send someone out at their own expense,as it is now a warranty claim as the unit is not working....they sent me a reference no. for this..and four days later...I am still waiting for someone to contact me to arrange the site visit to resolve this issue....this is just useless uphill fighting all the way with a co. that clearly is selling sub standard products....my next fight no doubt will be with builders warehouse to get them to put pressure on Ariston to make good...