Shopify Marketplace Connect

We installed this app to connect Amazon and Walmart marketplaces to our Shopify store. Unfortunately, we were unable to link our products. We opened a support case on the 15th of July, and despite assurances that Marketplace Connect's developers were working to fix our issue, almost a month later and we still have not had a response.

Shopify Marketplace Connect is holding back our business due to poor support, forcing us to look for alternatives.