I bought some pixels and connectors from DIYLED (not presales) and had some issues getting into contact with them when I had some that didn't work properly. Turned out their email server had sent my email into the junk email folder and they had not seen my email requests... ..which included my attempts to use the "contact us" button on their site.
Recommend you send Todd a PM via DIYC forum just in case you are in same boat as me....