Missing items that they don't want to give me

I brought items online and those thet could find in the store. I was refunded, but now I have 2 items missing. When I called, I received no assistance from the store, and the useless WhatsApp chat I keep using is not providing any help. Now, the useless chat is telling me there is a shortage of supplies, while I received an SMS on Monday saying my items are with the courier company.