I recently paid in total my Argos store card balance in total (I had buy now pay later from last year). It was due 1st August so sent the payment via my online bank account on 31st July, bank comfirmed they would receive it the same day. I've just received my statement and no payment has been applied plus I've been charged >£170 interest. I've queried the missing payment and they are going to enter into correspondence with me after further investigation. I also asked about the interest charged and was told it can be discussed once they have written to me.
I've checked myself and realised that I've mistakenly missed off the 1st 3 digits on my account number on the payment reference so it hasn't been auto applied.
My question is, if I can prove that Argos had my money in time despite my mistake can they legally still charge me some or all of the interest in the outstanding balance.
Thanks