To Accounts Department
Dear Sir/Madam
Re: Salary Query - employee number <insert>
For some months now I believe I have not been receiving the pay due to me. I have reported this to my boss <insert name> and he said I should approach you.
Please could you investigate and let me know what you find. The reason I think this is that <state any reason that might help>.
You can contact me on extension <insert number> if you require any more details.
Yours faithfully
Full name