Buffalo lost my parcel and placed blame on customer

I logged a return with shein and same was accepted. Buffalo was tasked with collecting the return which they did in November. The parcel, my dress was in transit for a while and suddenly it changed to cancel with a note stating that the customer which is me cancelled the order and said there nothing to collect. This was a blatant lie as the driver for buffalo collected my dress in November. I was thereafter asked to cancel my order and relog it. I thought this was procedural and I did it. When I wanted to relog the return the time to return was expired. Whoever I contact buffalo they send automated messages stating I must relog the return. No matter how I explain I receive the same email.... Relog return, relog return.

I'm starting to suspect ***** alternatively theft as my dress can not be located.