apple gesture of goodwill

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Hi new to this but could i ask a question?
I had technical issues with apple that took 2 months to fix , after an upgrade. It was sent away but came back in the same condition. After protracted time speaking with senior apple fault finders I was offered a gesture of good will of £170.00 after questioning the amount I was advised I could spend the money online in the apple website. I was not allowed to spend the money on any apple products and if I selected a product below £170 I would loose the difference. I was also not allowed to put the money to a more expensive product. After discussing with the advisor he said he would remove the gesture of goodwill !!
I wrote to Apple and received a standard letter by return acknowledging the issue but repeating they would not honour the gesture of goodwill.
Does anyone know what are my rights and what I can do about it?

all the best,

Carl.