I understand your disappointment, since it seems there is a "funny taste" like you said, you are welcome to contact your retailer support team or the Topgreen CS (
support@topgreencig.com ) in order to get your defective device replaced.
There isn't any poor batch or production fault but only a few defectives devices weren't identified by our QC team despite we improved a lot the production line in order to avoid as much we can defects to happen and we updated the QC team methods to identify failures.
Like I said before, probably a small plastic chip reached the heater through the air inlets in between the QC team tests (each device is powered on in order to check the device reaches the max T°, so a quick burn-off is already performed) and the device's packaging... or when you opened the package... or something is off set in the device and silicone touches heating wires, it's individual issue at the moment.
Plastic you mention isn't simple plastic but it's designed to stand with the T° used in vaporizers, as well it's out of the vaporpath, vapor doesn't even really touch the silicone or the outer plastic cover mouthpiece.
Like i said in my other reply you are welcome to contact retailer or company support teams (our CS adress is in my other reply to you in this post). Sorry for the inconvenience but you'll get your device replaced by one without any strong plastic taste, sorry again.