Hi,
This is a purchase from a template website, not our website. We do not allow any resale of HikaShop commercial editions since only us can provide the services attached with the purchase (updates, support, etc). However, technically, they have the right to include the files of HikaShop as they are open source, but they can't claim that it is "HikaShop Business" since it doesn't come with all the services that we include with it. So if they told you that, you indeed got cheated.
We would be grateful if you could provide the name of the template/developer of the template, so that we could first talk to them before any legal action. You can do so privately via our contact form:
www.hikashop.com/support/contact-us.html
On your end, you should be able to ask for a refund to them if you feel that you got cheated. If you do it via PayPal, there is a high chance that the refund will be validated by PayPal although it might take some time.