Appauling service from q master

I purchased a talisman pro tip from q masters for R190. The tip had a defect which can only be seen after cutting. I took the tip back to them they refused to exchange it yet talisman gives a guarantee on their tip or they give you 3 tips. The manager at q masters refused to exchange the tip and said i must pay for another. I support them very often and since last year august i already spent over 20k at this store. I definately would not support them again.