I had that issue with mine as well, solved with a 1.5x1.5cm beer can shim. Had to spread the clamp area just a bit to get it jammed in there though.
Haha, seller replied saying:
"It is normal 27.2 seatpost will be 27.0-27.2mm".
I replied saying "No it isn't, and your description doesn't mention that either."
@TurtleRecall started
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I had that issue with mine as well, solved with a 1.5x1.5cm beer can shim. Had to spread the clamp area just a bit to get it jammed in there though.