Phone charger cable faulty, have to hand in entire phone and I'm travelling on Tuesday

I visited the local MTN shop here in Hillcrest with my charger cable. I tested it and another cable works fine but I would like a replacement cable as the phone is still covered by warranty until 24 October 2017. I will be out of the country as of Tuesday till beyond this date so I will need to have the fault logged and sorted out before then if possible as I do not want to miss out on the warranty replacement of the cable. The local MTN shop told me I need to hand in the entire phone, box it came in etc and I cannot do this as I cannot be without a phone while I am away. The phone is fine. Please get back to me asap with a solution. I cannot afford the time to take the phone and charger to Samsung myself, as was suggested. Thanks for your help. Regards, Paul