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I came to know their so called TnC way months after my order, because it was linked as separate page from ordering portal.
As far as I know EU companies are required to provide the T&Cs in written form to the consumer before the order is being placed.
And isn't there a legal requirement for a checkbox 'I agree to the T&Cs' when placing an order?
unfair commercial practices ?
When you buy goods and services anywhere in the EU whether from a website, local shop or seller outside your home country EU law protects you against unfair commercial practices.
When promoting, selling or supplying products, companies must give you enough accurate information (see your right to online information) to enable you to make an informed buying decision. If not, their actions may be considered unfair. See Redress for steps you can take in response.
Since their B2Bullshit failed 'returning unwanted goods' seems to be a valid option, too
http://europa.eu/youreurope/citizens/shopping/shopping-abroad/returning-unwanted-goods/index_en.htmKnC competing with their customers (mining with more than the promised 5%) sounds like an 'unfair commercial practices' as well.
You were not able to make an informed decision regarding your purchase, right ?