Hi, sorry to hear you have a problem with your Anker lightning cables. You can contact our support by writing to firstname.lastname@example.org and request a replacement.
We need to have your order detail, the S/N of the cable and your shipping address in order to help you get a replacement. Just to clarify, if your Anker lightning cable has a 18-month warranty and is now out of the 18-month warranty, we will not send you a replacement due to warranty restriction.
Hope it helps and have a nice day!