Printer wants my file to have 100% black??? HELP!

Hello,

I recently finished some wedding invitations & sent them to a printer. They called me back & said that they needed the black to be 100% black and the pink to the 100% magenta. I have tried everything I can think of to change the colors, but they keep changing back to their original color.

For example, when I try to change the text to:

C: 0%
Y: 0%
M:0%
K: 100%

It changes it to:

C:75%
Y:68%
M:67%
K:90%

So why won't it let me change it? Please help me!!!

Thanks

Change your color mode to CMYK in RGB it will always change back to C:75%,Y:68%,M:67%,K:90%

Image > Mode > CMYK