I couldn't find anything as specific as that, but this letter terminating a business arrangement can give you some general ideas about style, structure and wording. If you put "terminate business arrangement" in a search engine, you'll find more examples like this.
If you are writing the letter and want any help with it, you could always try asking another question on Blurtit - someone can usually help.
If you are writing the letter and want any help with it, you could always try asking another question on Blurtit - someone can usually help.
