Mason Pearson Pocket Bristle Hair Brush B4

I purchased the Mason Pearson B3 and B4 brush. I thought I was getting such a good deal on the B4 for only $78 when elsewhere they are selling for between $140-160. The B3 was a lesser discount, but I figured I would purchase both from same seller, and since one of the brushes was such a good deal, it just seemed easier. I was very excited when the package arrived! I opened box and there was only one of the two, VERY expensive brushes purchased! I tried calling the seller- left a voicemail. It's been days and no returned call. I reached out to Walmart who contacted seller- still no response from seller. As far as the brush I received- I'm extremely skeptical that this brush is real/authentic. The bristles seem plastic and while researching, I've found that several of the identifying features to verify its authenticity, are missing. This is surely why the seller is not bothering to respond to me, nor Walmarts request to contact me. Do NOT trust this seller!!!