colouring hair extension

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   Hi I am new here. 
I love the website and this forum.
I am an extension fan and have been wearing them for 4 years now.
Recently i had my own hair cut to a slightly graduated bob and have dyed in Plum (more purpley / red).
I got the extensions but needed to dye them to match my newly coloured hair.
I used the same colour on my hair and the extensions but the extensions have come out a much lighter red shade and look completely different. 
I cannot put them in like this and need them in by friday night for a ball im going too.
Does anyone know what i can do to get a better match??
Thanks in advance