I'm not having a go, but it seems that multivision did their best to help you. 1 week late delivery isn't that bad. Wrong processor: 6days from collection to fix it. This doesn't seem too long. You had wrong memory modules put in. Surley you didn't expect a free stick of 512DDR.
Overall, it seems that multivisions support is quite good. Granted, they got a few things wrong and late but nothing that bad to shout about.
Delivery was late 1 week, They replaced, your processor (whick took only 6 days from delivery), and you wouldn't except the replacement memory modules, and you got your refund. Not much there to justify compensation.
Seems to me you were expecting to much and making a mountain out of a mole hill.