What should I do if the gold necklace I bought at Lukfook Jewelry has quality problems for about five months?
What quality problem? Is the purity of gold not enough? Or is the gold jewelry deformed during wearing?
If it is the former, you can talk to them. If it is the latter, you can take it to their store to see if you can exchange it for a new model for free. If you don't like it or don't want it, you can sell it to a gold shop.