Shopify Marketplace Connect

I had over 2000 sku live on Walmart using the Walmart app supplied by Walmart. I switched to this app and now I have lost over 1000 live sku listings and support takes 12 hours to ask me a question to follow up and then I answer the question and 12 hours later they ask a follow up question. This app has cost me my Walmart sales. Going to try a different app.