You said freewheel so I'll take your word for it. You also said it was new, which is interesting because I had a similar thing happen to a vintage freewheel. Basically, it was gummed up and had to be cleaned out with a penetrating oil. I then lubed it with some heavy oil. Worked like a charm. The pawls inside the freewheel can get gummed up and will not function properly. This one being new, not so much. Unless it is frozen up for some other reason?