Missing Order (Pathetic Service)

I would like to complain about the bad service from this company. My shipment has been in transit to destination from the 29th of November 2017 until today as per their website. Whenever I try to call their numbers ( ********** / ********** ) it’s forever busy. I am failing to understand why this shipment is taking forever. I paid for the 3-7 days shipment. I was told 2 weeks ago by the merchant (Wholesale7) that it is at customs. I need the package release and delivered urgently before the close of business tomorrow. The tracking number is #********4065