Don't know if anyone else here is the same boat, but i recently purchased a £499 chromebook using the interest free 5 x monthly payment option.
Order is stated as purchased using monthly payments in my account, product dispatched, and the full £499 debited from my card, instead of the 1st payment of £99.80!
Amazon on phone and live chat saying they are aware and looking into a fix, and will email me in due course... Nothing more they can do.
I contacted my bank, and they say they have to give Amazon 15 days to rectify, only after that can they intervene.
As well as a warning to others, wondered if anyone else here has had this happened to them, either now or in the past, and how did they get it resolved?