Sealy does NOT follow through on exchanges

After our bed not lasting 8 months, even though it was quite expensive, we went through the whole process of getting a new bed. Sealy was fast to approve an exchange but its been 5 weeks and I'm still stuck with a bed that hurts my body. Ok furniture simply says they are waiting for delivery from supplier. Sealy says contact the seller. Really? How does that work!!! I am stuck in a situation where nothing that I do seems to help. This is truly pathetic. If you've agreed that your product failed and a replacement is in order shouldn't that happen in a timely manner?? How is this customer service??