Some good responses by some very knowledgable people here. There is no way that you could have gotten a quality Damascus steel straight razor for $150, that to me is already a red flag.

As already recommended, a refund is your best bet. Then, purchase a decent quality vintage razor that is shave ready. If you buy it from this or other quality forums like Badger and Blade your chances of getting a quality straight for a decent price that is shave ready is virtually guaranteed.

The advice you can get here and the aforementioned site would be priceless.

Best of luck to you.