Cases like these usually happen in the event of an invalid/incorrect address or when additional fees must be paid.
DHL will notify you enough times and will give you ample time to respond to their messages. However, once they have declared that the package was rerouted, Blackbough is no longer responsible for the items or any fees that you may incur because of it. Kindly ensure that when you input your details, your shipping address and contact information are correct.
Blackbough does not offer free shipping back to the customer in cases where delivery was unsuccessful due to the negligence of the buyer.