Steam cancellation of add-on planes?

I got the Cessna 152 and I am appalled by it, is a cancellation possible?, thanks.

I am very happy with the Arrow.

Thanks Peter.

Refunded, thanks again Peter.

I did not know how to do this and keeping that aircraft model would have been a pain, I liked real life 150/152/Aerobats so this is still a disappointment. I'll give the Tomahawk a go instead.