QOO10 review: surgical mask

I ordered and paid for 2 boxes of surgical mask on 27 Jan 2020 under the seller Cosmo Junction and the system indicates that it was shipped on 1 feb. Today 7 Feb, the seller says it has shortage of mask and has to cancel my order.
If there was a shortage why was it made available to buyers in the first place and the system indicates that was already shipped? Obviously this is a case of the seller trying to fulfill other orders that paid a higher price for the same item. Unethical way of doing business.

View 0 more photos