Yes. Contact the charity you donated to. The charity holds your Gift Aid declaration and makes the claim to HMRC, so it can cancel or update it for you.
Donr collects Gift Aid declarations for charities, but we can't change or cancel a declaration once it's made.
If you're not sure which charity you gave to, contact us with the mobile number you donated from and the date of your donation.
Need help? Use our supporter contact form or email help@donr.com.