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Dear Sir or Madam,

We have not yet received your payment for the invoice dated May 30. This is to remind you that your total bill is now overdue.

please remit payment no later than July 15. If you have any questions or concerns regarding this bill, please contact me at 055 400 567.

Failure to respond may mean that your bill is turned over to a collection agency.

we look forward to continuing our valuable relationship with your company.

Yours Faithfully,

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Dear Sir or Madam, You are writing to a specific person who owes you money. "Sir or Madam" is only for cases where you do not know who will respond to the inquiry. e.g. Dear Mr. Kingston;

We have not yet received your payment for the invoice of $53,987.43 dated May 30. This is to remind you that your total bill is now overdue.

please (capitalization error) remit payment no later than July 15. If you have any questions or concerns regarding this bill, please contact me at 055 400 567.

Failure to respond may mean that your account being bill is turned over to a collection agency. (Note: In actual cases, this does not usually happen for three to six months.)

we look forward to continuing our valuable relationship (??? Is the relationship a valued one if you are threatening them with collections?) with your company.

Yours Faithfully,