Unprofessional sales advice

Very poor service and sales advice. They Sell to you an expensive machine (8kva) and then it does not comply to the specification for your purpose after delivery. When I called them they just tell me that they would’ve advised me that it will not work for my purpose, although I told them before I bought it what it will be used for. Their ignorance to just go with the argument that they would have told me …… their word against mine …… why will I buy a R25k machine if it will not work for me, surely I will know what specs I need ???? Their specification also specify 50hz but effectively it pushes 54hz which os not acceptable for my purpose. Upon my protest they tell me I must go higher to 20kva, but a smaller generator (5,5kva) I had before, worked perfectly ….. does such a comment make sense ? Absolute bad service and unprofessional. They just focus on the numbers, once the sale is done they take no responsibillity thereafter. Think twice before you buy anything from them.