Shopify Marketplace Connect

We integrated Codisto Shopify for our ebay stores in December and it's still not working properly. Support provides contradicting information and doesn't seem to know their own platform. They are based in Malaysia - send over calendar links for calls- you set up a call and they don't show up as the slot they sent is 4/5am their time. I can't talk to how the actual connector works as we can't even get support to set it up properly.