You don't need to do anything! We don't have your credit card information, and we will not send you a bill.
If you took advantage of our 7-day free trial but decided Piqosity wasn't for you, then we're sorry to see you go, but you aren't liable for any charges. At the end of 7-days your account will simply become inactive. No action on your part is required.
We hope that you'll consider Piqosity for future needs.