After Sales is worse than the products

We bought 6 x 1.5l Explorer Double Wall camping flask from Tevo Midrand outlet. We traveled to Namibia using or tried to use the flask. Within 2 hours our hot water was cold. We when to Tevo Midrand Outlet. But was informed that they need to talk to someone. The flask is 5 months old. We cant used them. Starting yo feel that the midrand tevo outlet are selling appliances that they no is not working. This is not our first disappointed with them. Customer service 0. We only buy bennett read but at this stage I think to change brand. We bought airfryers. Service 0. Then I got informed that i must complain to the company i got the airfryer from. Why do bennett read offer extra warranty if they cant delivery. After driving up and down from home to the branch x8.They make you wait and wait. Leave Messages no one calls back. Go to the branch. Service don't get better. So I am sitting with 6 flasks i cant use. An airfryer that they are borrowing me until they can replace mine. And this have been going on for months.