EC, according to the OP, he already did that, and they already said they are investigating. What that means is they call UPS and then UPS says we'll get back to you. I understand that in an ideal universe, shipments with invalid tracking numbers are magically found instantly. That isn't realistic.

The OP said they issued a NEW tracking number, presumably after shipping it a second time. This, too, is invalid. They can repeat the process with the same bad address an infinite number of times, and research it over and over, and they will still have invalid shipping numbers, over and over.

The OP needs to contact PAYPAL and find out what address is being sent from his account. SM isn't allowed to do that, and I'm pretty sure they have no clairvoyant's on staff.

There are four parties involved here, and numerous automated systems talking to each other. It is not reasonable to presume SM is guilty of being the cause of the problem. It is possible that SM made two mistakes in a row, and/or is employing an extraordinary number of people who are incompetent or enjoy annoying customers. But it is by no means reasonable to presume that, especially with what the OP has told us.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)