Customer service is something that I try to research before I buy a product. I heard Otterbox had good service and took care of its customers so when I needed a case I bought an Otterbox Defender as it fit my needs.
When I did need service...I got great service. I posted a comment about it here: Galaxy S4 Cases and covers!
An FYI regarding warranty service from Otterbox....
My Defender case inner shell was starting to 'squeak' in the lower left hand corner when held because a small gap developed between the two halves of the inner shell. I filled out the warranty claim this morning (this is at about 8AM PST Saturday morning), uploaded a couple of photos of the case and got a reply that I will hear back in 48 hours (business days). Then, 15 minutes later I get another e-mail saying they are FedEx-ing me a new case.
That's what I call service. Kudos to Otterbox.
I'm just posting this because your comment about Spigen's customer service is important and hopefully it may help someone in deciding on which case to buy. And the more people post about these problems, the better chance the company may improve its customer service or the quicker it will go out of business. Objective comments about products (good or bad) are very helpful and are a boon to consumers who take advantage of them
These (off-topic and rambling) comments are not targeted at the OP...they are just general observations....
Most buying decisions are based on price. Lowest price doesn't always end up being the least expensive. As an example, when buying a vehicle some people may look at two similar models with similar specs from different manufacturers. But one is more expensive because it's a built by a company with a more solid reputation. However, over the life of the vehicle, the more expensive vehicle ends up being cheaper due to lower maintenance costs, lower insurance premiums and higher resale value. So, buying cheap is not always cheaper.
Of course, researching products to death just to buy a case for a smartphone is overly anal and time consuming. But, at least with the Internet, we (anal folk) have that option.
Sorry to hear about your problems with Spigen and sorry for the long-winded, far-ranging post.