Failure to deliver

I am very disappointed with Buffalo logistics recent service. I ordered on the 7th of December and I noticed that I didn't modify my shipping/Delivery adress from my old one to the new one, I immediately clicked on the button that allows you to modify your order before it gets shipped and I got a confirmation from the via email that my delivery adress has been successfully modified. I even double checked and saw that indeed my current adress appears on my order. Now all of a sudden I pay customs on Buffalo on the 14th and notice after paying that on the Buffalo website my shipping adress is still the old one and I have tried to contact them with no luck.

Today I got an email from both shein and Buffalo claiming that the attempt to deliver my order has failed due to incorrect adress and no answer from my phone They are now saying My order is being returned, how do they return my order whereas I didn't get a call from them to inform me about the delivery? How can they return my order after just one so-called failed delivery? I'm a really hurt because I paid so much customs for nothing! No one contacted me but they want to return my order? This is utter *******, I need those items for my Christmas for my kids!