(Name of the other side)  Date: 
(Address of the other side)
Dear Sirs,

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Re : (please insert the matter in question, e.g. outstanding commission paid on 12/12/1999)

I / We* am/are* writing to demand from you the sum of HK$(please fill in the outstanding sum here) being price of goods sold and delivered to you (and interest accrued thereon from dates of the delivery [delete this sentence if you do not want to claim interest]) which has been remaining due and owing to me/us* since (please fill in the due day for the payment of the outstanding sum here). The Particulars on the outstanding sum (and interest [delete this if you do not want to claim interest]) on the goods sold and delivered to you are as listed hereunder :-

(the following table is for reference purpose only, you can present you data in a way that is suitable to your case. For example, if you did not issue any invoice to the other side, you can list out the kind, date,unit price and total amount of the goods that you sold to the other side)
Invoice nos.

Date of
Invoice

Payment
Due Date
Invoice Amount
xxxxxxxxxxx
date/month/year
date/month/year
xxxxxx
xxxxxxxxxxx
date/month/year
date/month/year
xxxxxx
xxxxxxxxxxx
date/month/year
date/month/year
xxxxxx
 
xxxxxx
Less: Amount paid on ******
xxxxxx
(delete this part if the other side did not make any part payment)
xxxxxx
Add: Interest on the outstanding sum at the respective due date of the invoice at the rate of xx% per month
xxxxxx
(delete this part if you do not want to charge interest)
Total amount due:
xxxxxx
 
Despite repeated demands, you have failed to settled the said sum or any part thereof as at the date hereof. (you can deleted this senstence if it is the first time you ask the other side to pay the outstanding sum)
I/We* hereby give you notice that if the said sum of HK$(please insert the outstanding sum) is not paid to me / us* (you can also point out the method and/or the location for payment here) within the next SEVEN (7) DAYS, legal proceedings will be instituted against you without further notice in which event you may be liable for the legal costs occasioned thereby.
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Yours faithfully,

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(signature here)

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(Block Letter of you name)

* Please choose one