Debit order went off on my bank account and I haven't ordered anything from Amazon!

I had a debit order that went off today from Amazon UK.... I have never used Amazon, I have an account with an old email address I haven't used for more than 3 years because I couldn't remember the password I recently got that email back but have never been on Amazon since back then... My Question is why was I debited? How did you get my account details of I haven't put it in myself? Please refund me my money back or I'll take further steps! Or since I was debited send me a parcel for the amount that went off my back account!! You can never want to ***** from me because I have never used your services, or ordered anything from you I haven't even been on Amazon until today, tried to go onto my profile! Give back my money please!