Customer complaint

I bought a geyser on the 24th Murch 2019 and the element died and bought the new one on the 2020,08,25. On the 2nd of November 2020 the new element died, I went to cashbuild to query and the sales man told me to go and take a picture of the serial number of the geyser, I went back to cashbuild and he started to phone around and they pushed him from pillar to post and coming back with no answer he said let me ascalate it to a manager by the na Sello, Sello listened to the query and said I must go and fetch the people who fitted the geyser with their qualifications which is plumber and electrician ...my answer was but when I was buy no one advised me to get the professionals and I asked where is it written in black and white on the wall that I have to find professionals they failed to show me,and the answer I got was the is a booklet indluded in the geyser that says that of which it was not there. Ok I am 67 years I can’t see clearly in my eyes why I was not advertised? So I can understand that I need only professionals to fit my geyser only now I am complain I was told. My concern again is what if I buy another element and it dies in three months like the one I just bought in August? Because I was told their technician is based i Pretoria and he can’t come to my place. Can I please help as my blood pressure is up and I can sleep.