Still no delivery after one month

My husband and I placed an order online on 31 December 2017, order number ********** 552 refers. To date, no order has been received, we have sent countless emails to ********** the South African support contact email address, all responses are very vague and basically automated. The latest response was that my order was delivered, when checking the email and contacting fedex, this was a different customers order number. I have never received such pathetic service from anyone, let alone a well established brand such as G-star. When my order was complete, the delivery period was stipulated to be between 7-10 days, as the parcel is coming from the Netherlands. One month on..and nothing...not even a reasonable response.