Hi,
I assume that the manufacturer has been no help? That tells a story in itself.
I recommend a US or European made controller, there are a number of such manufacturers who make excellent
products, support what they sell by email and manufacturer specific web forum, for example Warp9TD with their Ethernet
SmoothStepper or CNCDrive with their UC100, UC300, UC400 or PoKeys with their 57CNC.
Hobby CNC is very much a case of 'you get what you pay for'.
Craig