Alesis promotion isn't working at checkout

I bought an Alesis Q88 MIDI controller last week, and there is a blue sticker on the box advertising a promotion for free Sonivox VSTs (up to a $50 credit for DVIs, according to the website URL provided).

When I'm looking at the cart with the DVIs I want, I try to enter the serial # of my Q88 into the box, replacing the (21) with SVX as instructed to do so, but it keeps returning an "invalid promo code" error message.

I sent a support request regarding the issue several days ago, but have yet to receive any information as to how I may resolve this issue.
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