Yeah, weird that you have so many problems. I've never experienced any of that. Those delivery times I gave above are from the time I ordered the product. I've never spoken with any seller.
Here are two recent examples of my having to interact w/sellers on WangWang. Top half of screencap: have to confirm address or they won't ship. Bottom half of screencap: other seller waits two days to tell me that the stuff I bought was out of stock and I should apply for a refund (the items are still for sale on that shop btw).