Parcel not recieved from Dawnwing

I have received a parcel from the UK through Dawnwing which they cleared through customs. A lady by the name of Michelleq contacted my forwarding company in the UK that my duty fees were outstanding and Dawnwing was going to return the parcel to the UK. Then they gave me Michelle's contacts and I called her and she sent me the invoice. I paid the invoice and never received my parcel. The parcel arrived in July and I paid the invoice in August. When I contacted Dawnwing they say I have duties outstanding and my parcel has been auctioned at the state warehouse. I escalated the matter to a supervisor by the name of Nikki Hattingh and requested that she furnish me with her company's complaints policy and procedures. Initially she said her manager was not in and was to be available the following day. She has since ignored my email and has never provided the information I requested.