[Name, Company Name & Address here]
This is to inform you that I have placed a ‘stop payment’ request for the check [check no.] in amount of $[amount] sent to you on [date].
I did so because – [state reason here]. –
If you have any questions regarding this, you may contact [contact person] at [phone no.].
[Your name & Designation]
Encl: [Enclosures List here]