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Do you have a website and/or a snail mail address for this company?
Scamadviser.com says onecoin.eu is not safe to use. The website WHOIS indicates that this is a new webiste. It's hiding its registration information so that it's not possible to find out who the site owner is and where the business is located. That's especially important since the website doesn't give any contact information either.
When a business offering an investment opportunity doesn't give its potential investors the information it would need to thoroughly vet it, that business is always up to no good. There's a lot of very bad press about Onecoin. It's considered nothing more than a global ponzi scheme. Ponzis are unlawful, and when Onecoin can't get any more new investors to pay off the old one, like every other ponzi scam it will collapse. Meanwhile, if the authorities swoop down on it before that, any profits you make can be seized that way too.
You want to read this article, as well. Further, it's made other lists of dishonest bitcoin traders. There are many more.