I think it's reasonable to expect a better level of customer service if they're mostly doing international sales.
Mondince (like quite a few other brands featured in this forum) isn't really in the domestic Chinese market battleground any more so there's no excuse.
I wouldn't be as concerned with poor communication if it's a well-reviewed domestic brand like Pardus or Seka.
Personally my next buy is going to secondhand via Xianyu w/ Cainiao delivery.