Try this. I think you didn't assign the result of ashes_study to a variable when you did it.
library(dplyr)
ashes_study <-cbind(ashes_long,ashes_match)
ashes_study <- ashes_study %>%
rename(ashes_study, scored = `3` , balls = `4` )
# you could also do filter out your NA values here,
It would be good if you could provide a reproducible example though.