MTK phone refuses to wipe/format/flash anything or even be bricked.

Its my daughters bog standard, cheap chinese MTK6580 phone (uhappy up580 if it matters)
It came with stock 5.0 a few years back so I flashed TWRP, rooted it, ported a CRdroid 5.1 rom for it and was working fine. Yesterday on boot every app refused to start, or stopped, or froze including stock launcher and settings so I couldnt do anything at all. Booted to TWRP and wiped cache and dalvik but although TWRP said completed, it hadnt.
So decided to wipe EVERYTHING including data and again TWRP said it had but upon reboot the faulty rom was still there, not working.
Tried to flash a backup that ended in tar error, fixed that and it flashed the backup fine, rebooted but it hadnt.
Tried to TWRP flash a new rom, said it had but it hadnt,
Used SPFlash tools to flash the stock 5.0 rom, THAT said it completed after the usual time and procedure, rebooted but it hadnt
Used SPFlash tools to completely format and wipe the phone which also said it had completed but it hadnt.

I CANNOT wipe this phone using any method I know of! or install or flash anything! Just this same custom rom that was fine for years and just went wrong. Does ANYONE know how I can somehow wipe this phone or flash a new rom? Tried flashing a TWRP with SP tools AND a TWRP .img and they all said completed but obviously, nothing did.... I've accidently bricked phones easier than I can deliberately wipe this one

Any help greatly appreciated.

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