Vital Zing Australia review for Shopacado ‑ Volume Discounts

We used this app on a couple of our sites to help us with volume discounts. We have constantly had discounts that haven't worked for some customers without us knowing then had to manually check ourselves after complaints, ended up just giving us more work trying to fix the issues. Customer service hasn't been muich help basically saying it's a customer issue when it's supposed to be an automatic discount, that servers were just slow and were being fixed. Still have the same issues.