Terrible customer service

Buffalo picked up my SHEIN order in 17 March for a return. It’s been almost 3 months and I still haven’t received a refund from SHEIN. When I contacted SHEIN they said they haven’t received my package from buffalo logistics as yet. I’ve been calling them for months eventually in April a lady answered she told me she will escalate the matter and mark it as urgent and I will be contacted within 48 hours it been weeks no email or phone call but buffalo keeps on coming to fetch the package which they already picked up on 17 March. So I’m confused. Did my package get lost or ******?! It was a big package. Pathetic customer service coming from buffalo. This is very unprofessional! Buffalo please can you track my order urgently for the second time this is very frustrating now my tracking number is BUFEX***YQ. I look forward to hearing from you as soon as possible.