Still no delivery

I have ordered a 2018 dayplanner from the USA on the 24th of November 2017. Dhl picked up my order on the 25 of November 2016. Till date I have not yet received my package and it is already 9 January 2018. Needless to say I am frustrated as I do not have my planner yet and we are already 9 days into the year. I have tried calling the call centre, but get either arrogant responses or absolutely no help at all. What irritates me the most is that a year ago, I ordered the exact same planner, from the exact same vendor but the courier company that delivered was UPS. They managed to get my order to me within 3 weeks. How is it possible that you have such terrible service and are still open for business? Blows my mind. I will most definitely never make use of your service again.