Missin item

I'm a very good customer of shein clothing and they use Buffalo logistics as their courier company.Every order that I made which comes in a box,is perfect.If the order comes in a plastic bag the courier guys find a way of *****ing an item,n they make sure it's only 1.I have had items ****** 3 times so far,today was the 3rd.There is really no way of getting a hold of the courier company,their whatsapp and emails go unanswered. It's a bonus for the guys who deliver n ***** but a lost to us