Possible Fraudulent Invoice –
[Name, Company Name & Address here]
We acknowledge the receipt of the invoice no. [no. here], dated [date] from you.
Please note that we never ordered the products listed in this invoice, nor we have dealt with your company in the past. Also, we received similar bills for unsolicited products from your company a couple of months ago.
In our view, this is an unethical and illegal business practice. We have notified the government authorities regarding this matter and you will receive the legal notice very soon.
[Your name & Designation]