Manager told me that its not his problem that i bought cheap punch

We Purchased x4 paper punch from them that were faulty and they exchanged them and when the replaced punch broke. We get told that at the beginning of the transaction we were given plenty options for paper punches and we chose that one and that isnt their problem that we chose a cheaper one and now its broken. They will not be replacing it. Such utterly disgusting attitude from Imtiaz and his manager. Never buying from them again.