Need Money For Porsche T-Shirts - Poor Quality and Poor Service

I purchased 5 shirts from NMFP (Need Money For Porsche), 4 have arrived and I found the sizing and quality to be very poor, of the 4 that arrived, 2 shirts had the same tags and material and the other 2 shirts had different tags and materials. I have raised this with the person who had emailed me ‘Tiffany’ and have received no response, I also asked Tiffany to refund me for the 5th shirt before it is shipped to me, I have also received no response to this request.