Pegasus Airlines Denied Boarding Over Tiny Baggage Weight Difference

When I went to the counter for check-in, the guy said that I had extra luggage, which was literally 0.9 kg extra. When I measured my luggage at home, it was 20 kg, and at the airport, it was 20.9 kg. And they made it troublesome for me, saying I needed to either pay or remove items. You can imagine how frustrating it is to open your luggage in front of everyone to take something out. 0.9 kg is simply a jacket. It is really nonsense of Pegasus. Because the guy said Pegasus strictly requires it. So what I did was remove a jacket and wear it on me. But I was already frustrated before a long trip. Pegasus has no right to do this. They should calibrate their scale.