I'm writing regarding Peter Smith, who joined the ABC unit on September 27 [whatever date he started]. Per his contract/acceptance letter/hiring agreement [whatever you use], his annual/monthly/weekly salary [whatever you use] was to be $____ [in the currency and rate as appropriate].
He has only been receiving ____ [the lower amount he is getting].
I told him to contact you, but I would also like to ask you to contact him proactively and do whatever is needed to get this fixed and to ensure he receives the back pay he is due before the end of the year.
Thank you for your help in resolving this promptly. Please call me with any questions.
Student or Learner