You have decided, mutually or independently that the working arrangement isn't working. These are the steps we recommend:
Check the terms of the agreement. What is the notice period?
Let us know that you will be terminating the agreement - email@example.com
Have an in person (phone if that is not possible) meeting with the individual terminating the arrangement
Follow up with an email confirming the end date and whether they will work their notice or paid in lieu of - copy us in firstname.lastname@example.org
We will follow up directly confirming the final invoice amount and debit dates
If you feel the professional has behaved inappropriately and it is more serious than the chemistry/culture match was not right, please let us know right away