From my personal experience the only modular brand that has sucked in terms of poor support has been MALEKKO!
Everytime I called/emailed them there was ZERO and I do mean ZERO response. BOO! Not sure why they stink so bad?
Other modular companies that I contacted like Intellijel, Make Noise, WMD, and Noise Engineering always helped me patiently with my questions and support issues. Heck, I even had Scott Jaeger of IME/Harvestman and Rick Burnett of Erogeneous Tones reply to my emails directly. At least my Malekko modules still work. I love my dual Borg filter.