Also, here's a the terms & conditions for the same:
Returns and/or refunds of prepaid services are dictated from the original place of purchase return policy. Either HP or Customer may terminate this Agreement by providing at least thirty (30) days prior written notice to the other party... for mode details: click here - search for "termination".
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Thank you for your advice. The contract says, "The Customer may terminate the Agreement directly with HP, by submitting a cancellation in writing to the address or calling the number provided below." - but I can't find the address to write to. Is there e-mail address to do?