Can't understand why they told you that you had requested payment into your bank, when you say you hadn't.
I received a share cheque the other week, and on the attached form it also gave me the chance to have my dividend paid into my bank.
Since my local branch is closing, and it means a long hike to another branch just to pay in a cheque, I decided to have future payments paid into my bank.
Filled in the form, and they in return acknowledged it's arrival and confirmation that my payment method had been altered.
Of course I could have gone on to their web-site and done it on-line.