Disappointing Equipment performance and bad product reference

Good Day, On Saturday 27/07/19 at about 4pm I purchase a Spray Gun. The Sales Consultant assured me that the tool has be used for Low & high pressure. When I used it on 3 bars low pressure the bottom tank keeps on cumming off. Also the gasket been used is a cheep piece of foam which expanse it he fitting thus not connecting properly when refilling the tank. The paint of the handle also dissolve during use. I paid R740 for this product. I could rather have paid less or even more at your store for a better Spray gun. I'm a am infuriated by the quality & performance of this product