I Recently did a fencing job using cement to set the posts. Client claims that the cement has discoloured his

Recently did a fencing job using cement to set the posts. Client claims that the cement has discoloured his brown colour concrete path. I offered to paint it but he claims that the colour was mixed into the concrete and will not accept painting. There are signs of fading in the concrete. Can you help? I do not... show more Recently did a fencing job using cement to set the posts. Client claims that the cement has discoloured his brown colour concrete path. I offered to paint it but he claims that the colour was mixed into the concrete and will not accept painting. There are signs of fading in the concrete. Can you help? I do not understand how the cement can impregnate the concrete especially as we washed it off the same day. Any suggestions how to fix it.
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