CourierIt Sticker on my vehicle

I was parked in a loading bay today around noon in Dreyer Street, Claremont. Outside ArtLand Art and Framing shop. They had just a big painting packaged up for me and my package was 1.5m long and 1m wide and weighed 15kg. I parked in the loading zone as I was loading this up into my vehicle.

I had borrowed a vehicle for this big collection. Only to come back to my vehicle to find a big sticker on my window from CourierIt - who probably assumed I wasn't loading up something. I am a one man business and I don't have a delivery vehicle.

Not only am I having difficulty pulling the sticker off the car, that isn't owned by me but now it's my problem because YOU assumed something.

Absolutely DISGUSTING for a business to behave like this.