Very angry customer

I ordered an item online from trends clothing (http://trendsza.mybigcommerce.com/) 3 months ago and i have yet to receive it. Despite my numerous attempts to find out where my parcel was the only reply i got from them was that they "don't know" where my parcel is. As a very angry customer does, i once again asked them about my parcels whereabouts and got a very snotty/sarcastic reply from the person running their social media (See attached images). I posted the conversation on my social media and obviously my friends started ranting with me, this just lead to us all being blocked off Trends social media as they can't handle unhappy clients. Please feel free to search them on Facebook, i am not the only unhappy customer waiting for a package that probably does not exist.