Nzinv is scam or not?

I have been in a site called Nzinv for more than five months and earned a lot with it.I have invested more than 700$ and already withdrew approximately 2600$ .Isn’t it awesome? Oh yes,it is indeed! They are going so good.They have a physical office too.Thats why I had no tension about trust issue.Their address is ”40 HOLBORN VIADUCT, London, England EC1N 2PB”.If you are willing to participate too then follow my link to  Join here.