You may use the template below for notices of cancellation to a vendor. Fill in the blanks and keep a copy for yourself.
CANCELLATION OF AGREEMENT
To [name and address of company]
I/we hereby cancel the following agreement. Name/number of the agreement: _____
Date of the agreement: _____
Name of customer(s): _____
Address of customer(s): _____
Signature of customer [only if you are sending the complaint on paper]