Thanks for the replies everyone. It wasn't a company, two tradesmen that quite a few people recommended so I was surprised how bad it was.
Re the joints, they are extremely noticable and the sealant or whatever it is is grey so alongside the black granite, well you can imagine!
I really would just like them to take it away, I fear if they start trying to correct it they'll just make it worse. It seems that some of the slabs of granite are of different thicknesses so I really don't see how it can be fixed without replacing it. I'm worried he won't be able to take it up again or if he does will he wreck my beautiful kitchen units in the process?
Thanks again for your replies! I'll keep you updated, hubby called him yesterday and he's coming back monday morning to look at it.