I didn't get all of my parcels

I made an orders on the 7th of December 2023 I ordered 5 items but I only received 4 items I wrote in their email and complained about the shortage I even called their number and they promise to do futher investigation but up until now they didn't come back to me I sent another emails to remind them they don't respond any I need a serious help cause I really paid for that goods yoh online purchase 🥲🥲🥲