Hi, it’s been a while but I figured i’d reply - I’d actually spoken to you on Discord about this around a month earlier 
I did open a ticket and get my unit sent back, but Chinese customs weren’t able to find the address & said they couldn’t contact seeed via phone, so they shipped the unit back to me via sea mail… which took forever.
It arrived back here a couple of weeks ago; since I don’t particularly feel like spending another AU$50 on trying to ship it again, I just ordered an STM32G030F6P6 and replaced it myself - works just fine now 