All cars get swirls, dark colours just show it more. I've no idea who you used but there are loads of valetters around these days and half of them are no better than the sponge monkies at the dealers. It it swirls you have or is the hologramming and buffer trails too?
See what the guy comes back with but I'd be seeking a second opinion from someone local to you on DW. To be honest £200 seemed a bit cheap to me, I was quoted £900 to correct a brand new car that ultimately I rejected and took my business elsewhere.