apple,
I'm not quite sure where your numbers come from - unless some of the pension has been commuted?
Since gratuity = 3 x pension (pa as quoted by you) :
An error of 70k in gratuity would imply an error in the pension of 23.3k
or alternatively.
An error of 6k in pension (pa) would produce an error in the gratuity of 18k.
Hence my confusion and assumption that some form of commutation must be involved? If some of the pension is to be commuted the correct calculation of this might well be where the error has been made, either originally or now.
Any more detail you are willing to supply would be appreciated. For some strange reason we all seem to take a great interest in pension matters!