I have been dealing with RepairTech now on one issue for nearly 8 months.
My first monitor (DGM L-2362WD 23") developed two lines of dead pixels. I spoke to DGM (who also use RepairTech) and they arranged to collect it next day, which they did.
However, it took over 80 workings days and two emails from Trading Standards before they finally sent me a replacement.
Just over a month later this replacement has developed a fault (possibly two) that after seeing only two photos I've sent them they claim is customer damage (pressure marks) and they won't even pick the thing up to diagnose it properly.
I am continuing to fight with them but will be flat-out avoiding any company that has dealings with these people, as I have had nothing but grief and empty promises from them.