Lol coupon exploit

Not really an exploit but its exploiting the fact they probably dont know about it...
Sorry if I posted this in the wrong place: please move if I did.
Just found this coupon for reseller hosting:

goto >
http://www.host-star.info/
choose webhosting >
Reseller hosting >
Carry on through that shit >
Then when you come to the cart, type the word "test" as a coupon.

Should lower the price from $15 per month to $1.50
I sent them a complaint because they didnt add my addon domains or allow me to add subdomains and they said the package should include this and they have me $20 in my account.

So I essentially got a free years of reseller webhosting