No, we do not. The terms and conditions clearly state that the cost of returning items is borne by the customer. This is also detailed in our FAQ about the return policy.
However, if you have paid with Paypal then you can ask a refund of the shipping costs from Paypal. See https://www.paypal.com/be/webapps/mpp/refunded-returns for the exact terms and conditions. This is a service offered by Paypal (not The Canyon Store!), and only valid for orders paid with Paypal. Again, this service is offered by Paypal (not The Canyon Store) and you should contact them for the exact details.
update: Starting November 27, 2022, PayPal will no longer provide Refunded Returns or accept refund requests for return shipping costs. Make sure to submit any eligible claims before the above date to help ensure they get received and reviewed as usual.