It's stuff like this which made me pull back from using TikTok as a sales channel - they had some pretty insane rules. Made Amazon look sane !
The worst was that they set the delivery timescales, based on the carrier's claimed transit time (e.g. for Royal Mail Tracked 48 they allowed 4 days). If there was no tracking showing delivery by then, they'd remove payment from your pending payments, refund the buyer and let them keep the goods for free.
I like the idea of TikTok, but they make YouTube look easygoing.....