This sounds like my recent experience. I placed a big order on Feb. 20th ($699, 8kg) and it showed an estimated shipping date of calendar wk. 9 (not a system I was familiar with). When that week came and went I emailed and was told that some items were out of stock but they'd be along shortly. Everything I ordered showed in stock at the time (or else I wouldn't have ordered it) and continued to show in stock on the website. When I asked to cancel any out of stock items they ignored the first request and in response to my follow up insisted that they "don't change or cancel any orders".
Ultimately the order did ship on Friday and I received it today, intact and seemingly untouched by Customs. I wasn't thrilled with the runaround they gave me and their general unwillingness to disclose what was out of stock, update their website inventory, or modify my order, but I was happy it went smoothly after that point. Good luck, I hope all your stuff comes through soon.
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Yup, that sounds like Estervals shipping/comms. I've always just chalked it up to cultural differences. I've been debating a similarly sized order; all things considered that's pretty 'smooth sailing' if there weren't any hiccups with customs.