New Rolled Grass - Colour Concern

Hi,
We've recently had a new lawn laid by a professional landscaping company. They needed to make several trips to collect rolls of turf as they installed it over a couple of days. After returning home one day, we noticed two clearly different colours. The gardener continued to lay the rolls and ensured us that the grass is exactly the same species from the same source and within a week or so the colour difference would not be noticeable. He took the extra measure of getting the supplier on speaker phone to reassure us as well. Whilst the firm have actually proven to be sloppy in some areas, we trusted them to continue...

More than a week on and whilst there's been some colour change, I remain unconvinced that the difference will soon become unnoticeable. Here's a comparison between day 1 and day 7...

I'm extremely interested in the opinions of this experienced group as to whether or not you think I'm being spun a line here, or if indeed this colour difference will fade away. I'm contemplating withholding payment [for the lawn portion of a much larger landscaping job they're undertaking for us] and would value a second opinion on the most likely colour change over time.
Thanks in advance for any inputs.
-Chris
We've recently had a new lawn laid by a professional landscaping company. They needed to make several trips to collect rolls of turf as they installed it over a couple of days. After returning home one day, we noticed two clearly different colours. The gardener continued to lay the rolls and ensured us that the grass is exactly the same species from the same source and within a week or so the colour difference would not be noticeable. He took the extra measure of getting the supplier on speaker phone to reassure us as well. Whilst the firm have actually proven to be sloppy in some areas, we trusted them to continue...

More than a week on and whilst there's been some colour change, I remain unconvinced that the difference will soon become unnoticeable. Here's a comparison between day 1 and day 7...

I'm extremely interested in the opinions of this experienced group as to whether or not you think I'm being spun a line here, or if indeed this colour difference will fade away. I'm contemplating withholding payment [for the lawn portion of a much larger landscaping job they're undertaking for us] and would value a second opinion on the most likely colour change over time.
Thanks in advance for any inputs.
-Chris
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Look like different grasses to me - sorry. The fact that they didn't have all the turf when they started, and kept going back for more, sounds very odd to me. You say they've been sloppy in other ways too, so the whole operation doesn't sound brilliant.
It seems to have established well though, so perhaps it will be less noticeable in time. Not sure how you would fare trying to hold payment.
It looks a bit dry and cracked. The soil is usually dark on freshly cut rolled turf without much cracking.
Maybe just the picture but it looks rather pale and dry, points to not very fresh turf as already mentioned but a point you could make to the company
Will they still be on the job in another weeks time? I would be inclined to pay, but negotiate a discount as AnniD says, or ask can you withhold a small portion, payable if the grass turns out okay.
Thanks for the inputs everybody. Jury’s clearly still out on how likely the colour change will be.
Again, I'd question the ability of any firm if they couldn't work out the right amount for the space. It's basic maths, after all. The whole lot should have been lifted and delivered at the same time. However, whether you can gain anything by that is another matter, let alone a refund or reduction of any kind