I made a phone call and German based company started online in 1999 not publicly traded company, claimed it is providing even 9 % per month depending up on the business, but it assured 4.78 percent per month.
I asked if they have the financial statement available , not being publicly traded company, do not have to show to public.
I is another Bernard Madoff  kind scam. I would not suggest to invest ( minimum investment is 5000).