Fast forward to recent, i receive an email from them about an Order that i've place, which i have no idea of because i've never done such and mind me i never even open their emails i always just select and delete them

Fast forward to recent, i receive an email from them about an Order that i've place, which i have no idea of because i've never done such and mind me i never even open their emails i always just select and delete them. So i sent them an email telling them that i haven't place any order and have no idea of such. They responded saying that the goods have been delivered and signed off, so i must go and make an affidavit so the matter can be investigated by their ***** department.