You bought a very expensive item and got no receipt??
You bought a very expensive item on a whim, without doing market research first??
The seller refuses to refund your money and cancel the deal??
You're effectively $10K out of pocket?
Sounds to me like you just purchased a Masters Degree in Life Skills, from the University of Hard Lessons, for $10K.
Stand in front of a mirror and recite 50 times - "A fool and his money are soon parted".