[DATE, ex. Monday, March 31, 2008]

[NAME, COMPANY AND ADDRESS, ex.
Link Building
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]

Dear [NAME, ex. Link Building],

We have just received your payment of $[AMOUNT, ex. 5,200.24] for [PRODUCT(S) / SERVICE(S), ex. your order of five Magnaflux compressors].  Our records indicate that you have overpaid an amount of $[AMOUNT, ex. $200.24].

Ordinarily, we issue a credit to be used against your next invoice, but I know you would prefer a check.  Your satisfaction is our business.  Enclosed, please find a check in the amount of your overpayment.

Please call me at XXX-XXXX if I can be of any assistance.

Sincerely,

[YOUR NAME, ex. Jill Jones]