If they didnt replace the stick, why would you purchase their brand again, go for better brands like Corsair, G.skill, Elixir, there are many more.... And yeah, its not that uncommon..
Like i had very bad experience with GIGABYTE, DeepCool and so i refrain from using their products in the future... If you have a bad experience on the customer service side, you should avoid that brand. The service support was just so bad that i dont even mention anyone buying GIGABYTE boards and also even tend not to comment on gigabyte cards or boards. Deepcool is also another example, although i didnt expect better service support from DeepCool.
Always remember this advice, either buy OK products with great customer support or buy premium quality...