怎樣用英語寫一封催款信？

來源：ChinaBec.com

Sentence :

We shall be pleased to build/enter into good business relations with you at an early date.
Best quotation and sample books will be sent to you upon receipt of your specific inquiry.
We are willing to build business relation with you on the basis of equality, mutual benefit and exchange of needed goods.
You have been recommended by the CCPIT as a good exporter of Chinese peanuts.
We have been in export of bearings line for many years.
Our core value can be found in five professional criteria: Teamwork, Ownership, Innovation, Effectiveness and Efficiency, Customer Consciousness.
We highly appreciate your close cooperation.
We would appreciate it if you could/would do sth. OR It would/will be appreciated if you could/can do sth.
We assure you of our readiness/sincerity to cooperate with you.   assure sb. that / of sth.
Please be assured that we shall revert to your enquiry as soon as possible.
We will be obliged if you will give us your immediate and careful attention.
Your prompt reply will be appreciated.
We look forward to your favorable reply.    We are looking forward to hearing from you.
Your prompt attention and early reply would be highly appreciated.
This offer is subject to our final confirmation.
It is known to all that Chinese teas are of best quality and moderate price.
If you have any other requirements, pls let us know without any delay.
It is believed that our customers prefer quality to quantity/price.
In reply, we would like to say that it is difficult for us to do business on your terms.
As per your request, we have shipped your order by s.s “Peace”.
Since the required articles are not available at present, we would like to recommend herebelow a few popular items/similar items with your demand for prompt shipment.
We can assure you that our prices are always in line with the present market.
Should you ever need anything/have any question, pls feel free to contact us.
In view of our longstanding business relations between us, we are willing to coorespond to your target prices by reduce our prices by 3%.
The prices are already our rock bottom prices, and we really cannot afford/make any further concession.
Please modify the clause accordingly.
Candles are packed 20 pieces to a paper box, 40 boxes to a carton.
Pens are packed in boxes of a dozen each, 100 boxes to a wooden case.

Phrase:

Illustrated catalogue\brochure   annual turnover   credit standing   specialize in
corresponding to with      regarding sth   to pay by an irrevocable sight letter of credit
As requested     herewith = with this    without engagement      hot/slack season
make delivery / take delivery    in one’s favour/ in favour of sb.    probability/likelihood
lower/cut/reduce one’s price by (to)    superior to/ inferior to   meet sb halfway    forwarder
under the circumstances    in this case     additional charges/expenses    in addition to