Poor Service

I purchased a few items online on the 17th September 2017.SInce then I have contacted Deal man to trace my delivery. They have given me the run around and keep supplying me with a different tracking number for China post every time I contact them. When I enter the tracking numbers that are given it says "the number is invalid and China Post has not received this parcel" I'm frustrated as all I require is my parcel that I have already paid for and I have no way of contacting Deal man but via email which by doing so I get the run around.