Webkul MultiVendor Marketplace

We have been trying for weeks to get this app up and running with a test vendor. Support is very unhelpful. I have asked a number of times to have a call with support and I am unable to get someone on the phone. They sent one line emails back that do NOT help. We are currently looking for a new app to do what this one claims. I would love it if this would work, but we can not get products or images uploaded. On top of that, I can not get an answer if inventory levels will link together.