Confusion with 2 profiles - No ownership to resolve the issue

For one or other reason, we are 2 clients who are on the same account. I have ordered goods, when I did not get the information to pay duty fees I followed up. I saw someone else's information and asked them to correct it. I then received the email and paid the duty fees. Now Buffalo couriers do not want to deliver my package as they say Shein has to give them the correct information. Shein kept on saying they did. I am left in the middle of this, and no one of these 2 companies is doing anything to resolve the matter the one is referring me to the other. I have been struggling now for 3 weeks. The other person did not sign for the package as it was not hers and returned it to Buffalo, yet after several emails and phone calls to Buffalo they do not deliver it to my correct address although I explained this situation to them and provided them with emails from Shein which doesn't mean anything to them as they want the information from Shein. Shein should contact them and sort it out, but they do not!!!!!!