omega 2,5

I finally bought an omega caravan 2.5. price was all ok. he took my b vectra for 3000,- in payment and I should put 200,- euro on it. after the test drive the problem: bender. he said, I do not, no problem. tuv also everything new. today I was there and wanted to pick up my car, but my car is not finished. he has to plug 1500,- euro, complete exhaust system with curved, tooth belt, brake, oil change. for this he now wants my vectra with the expensive alufelgen, was left without. just because he now has too much cost himself. the vectra is 09/97 and has run 160000 and just made tooth straps and sockets. is the diel fair? omega 05/97, 125000 run, with beige leather, bc. seat heating in front and back