How do I use the product I purchased from you. You charged me $19.99 for e-books and I cannot use.

I cannot figure out how to use the product I purchased from you that cost me $19.99. I have had no communication from you indicating that you got the payment but my checking account was charged. How do I use this - where do I go, what do I do. On top of that, I am using a Nook not an i-pad, does that matter. Please help - confused in St. Augustine, FL. Thanks, sharicawley@lslink.com

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