QuickBooks Desktop Connector

Have lot of issue in transferring data to Intuit QuickBooks Desktop, customer service has no clue to resolve the issues and we are bounced back to QuickBooks

When QuickBooks discontinued their POS they recommended Shopify as they had created this app to connect the two... as others have stated we have had nothing but trouble. It took about a year to get everything resolved and now we are having the same syncing issues we had last year and the app developers seem to have dropped off the face of the earth and Shopify seems to have washed their hands of it...