Hisense bad service

Bought a cellphone (E70 Pro bundle) via Edgars which came with a set of earbuds as a 'free' item. The phone itself is working well so far but the earbuds was faulty out of the box. Only one side worked so I took it back to the store where it was swopped for new ones. The news ones were tested in store and found to be non working. The store offered to contact Hisense and ask for support or replacement but was told that there is no warranty on free items. This is very disappointing since the free item was part of the reason for the purchase. It is also strange that Hisense as a company are not concerned about the quality of their products and are willing to let customers receive faulty goods with their brand on it and out of the box too. The earbuds are not expensive but it is the thought that counts. I am a owner of a Hisense Smart TV and liked the brand.