Unable to access online book - coupon not found

I've just purchased Windows Communication Foundation 4 Step by Step by the author John Sharp from my local bookstore. The book comes with free access to its online book. However, the coupon code given is invalid. I can't access to the online book and practical files as well as the code examples. I've emailed the support center but they haven't replied. Does anyone know how long they will take to reply a customer's email? And does anyone know how I can fix this rather than just keep waiting for a response?
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