Indeed, Bitscalper is the one who took your money. Miningbuddy was just trying to clean up his mess.
Looks more like Miningbuddy got suckered by bitscalper along with everybody else. Bitscalper himself said the funds were "stolen" a long time ago, after a month of inactivity.
I'm stuck now because all the funds left were stolen
Naive yes, scammer no.