Quoted from Crash:Been there, done that. Dominic (Rappelbox), Joerg (Lucky1), and everyone else still involved with PIN2DMD are crooks. Force a refund with a credit card chargeback then buy a DMDMK66 from PinballSP. Nearly the same product, but it's all plug and play with similar features and high quality, and the seller is very active with communicating with customers. Bought 2 so far and happy to report no issues at all.
https://pinside.com/pinball/forum/topic/dmdmk64-new-dmd-multicolor-by-pinballsp-is-on-the-way/page/15#post-4536985
You use very strong words, I have used Lucky or Rappelbox help many times , they always tried their best to help me..