Summary: You may have to terminate employees due to business demands and it may not be an easy situation. You may not be happy with services provided by the sales companies so have this right to terminate their service and you can certainly make your situation polite and simpler by sending an email to them by following the below mentioned format. This format is simple and well written and can be used by the company in such situations.
Mr. Trent Fredrick
Dear Mr. Fredrick,
On behalf of Protext corp, I would like to inform you that your sales services have been terminated with our company. Since we have spread our company to the software wing, we have taken this decision.
Please send us the pending invoice and we will transfer the amount in your account. We thank you for being with you and it was pleasure working with you. We may contact you in future for any kind of guidance. Even though the professional relationship has come to an end, we would still remain friends. Thank you for rendering your best services to our company and we wish you all the success in future.
Mr. Ashley Thomas.