Could you please correct grammar and formal letter

[panca]

Could you please correct this letter to formal letter and grammar.
Looking forward to hearing from you soon. Best Regards,

Dear Customer

Subject Cancellation pool service

Regarding at this moment, our company have not enough staff on the number of customers, it's make low effective service.
The company does not want to make customers dissatisfaction. So, we would like to cancel pool service in the next year.
The company still service your pool untill December 31, 2010.
We wish to thank you for you valued customers and know that you will understand the necessity for this matter .
Best regards,