sorry that happened. A bit of advice, in my experience it's always best to be upfront about your issue (which you were) and what you EXPECT to be done. In this case, I don't know if you made it clear from the beginning that you'd like a refund/exchange/etc. When we submit a complaint, I'm sure we'd think it would be a NICE gesture if they offered to replace the product. We sometimes EXPECT them to KNOW what we want, which I don't think is fair. They are not mind-readers. (not coming down on you, eldo, just the consumer with a complaint, which many times has been me) I know that LOTS of places forward the complaint to the manufacturer and it stays at that, UNLESS you specifically ask for a refund or compensation.
Having said all that, I think you should write them back, nicely of course, to ask that you be given a refund or exchange. Also, if there's a cs number to call, do that. It's much easier for them to turn someone down by email and less difficult by phone.
good luck!!