myDelibox review for Cin7 Core

We worked with them for the last 5 years and they had a good customer service. Now after a week from the first support request, they are still unable to update stock level on Shopify, and apparently the best they can do is writing you back once a day at the end of the day, and not sorting the problem yet. BAD customer service. We are losing sales because of this. Stock level is not updated and we have constant overselling that we cannot fulfil. Can you please URGENTLY fix this problem?