I am sorry man. I had the Mini2, too and I liked it very much. I changed the cable several times but weren't able to damage it (never tried of course
. They are tiny and fragile appearing. That is why I treated it accordingly. I think you cannot judge all ChiFi by this single incident. The Rose Mini line is a tiny fragile line. I loved the Mini2 sonically that much that I ordered their flagship Mini6. I hat twice issues with the MMCX connection on these, too. But yesterday I received the third pair after insisting on a dedicated QC by Rose. Now, they are working well. And they delivered a different MMCX cable with the replacement which are very easy to connect and disconnect. Honestly, I had to use this cable as I was not able to plug in the original cable on the left unit at any force or with any methods I tried.
Maybe this is the main issue in conlusion...the stock MMCX cable is not perfectly matched with the Mini line. Too tight fit.
BTW, the Mini6 sounds fantastic! That is why I went through two claims with Penon/Rose in a >3 months time frame with the goal to get a working pair in the end and not my money back.
BTW2, I had to pay only 5,70€ with German Post (incl. tracking ability) to send back the unit (Penon asked to send back only the headphone units without any accessories or original packaging to Keep it small). The shipping costs were compensated in the end by Penon, too!
This is a really good dealer!