Cayonone…I, too, have the exact same situation and received the same email from mijireh. Woocommerce will not let you get support unless you have purchased from them. This is just a back-hand trick to get us to purchase their products rather than be supported.
I just sent mijireh this:
I am sorry Randy but this is a pass the buck, bullshit answer, the forums show this is not an isolated incident between mijireh and WC. You have to get it together. It is up to mijireh and WC to work this out.
As you said, “Why is the URL they are telling us to use for the redirect after a successful sale resulting in this odd webpage?” You need to find this out!!!!
Mijireh should know what URL to send it to. You are at fault here. You need to contact them and do this, many of us are very upset it is not being handled and there is no way we have the resources to figure this out.
Please get it handled. Mijireh is about to get a very bad name for this lack of support and communication with WC.