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Under the Act they have to repair it, and it won't be unreasonable to expect them to repair it with the genuine parts.
So you could argue that unless they replace the parts with genuine parts, you will return the car under the Consumer Rights Act, or accept the car with an appropriate compensation.
It may be the right time to issue a letter before claim.
I can't draft one for you I am afraid, but good templates (free ones) are available here: Problems with goods - letter before court action - Citizens Advice
Me too. I hope all goes well.