Micky my man, you were not "hacked". You simply used the same password for OCUK as you did on another site. That other site must have exposed your password, either in plain text or encrypted - if it was encrypted, it was easily 'decrypted' using a rainbow table. This is why you need to use complex passwords, because we know the encrypted versions of every simple/previously breached password and this means they are now totally pointless, forever more.
Your deets were then sold to some chancers out in India who tried to create a convincing MM for sale thread in your name.
Good job on promoting 2FA though, as this gets around the issue of passwords becoming more and more meaningless as more and more breaches happen.