Signed up to pay Self Assessment tax bill through PAYE but still fined for late payment?

Indicated on my tax return that I wanted to pay my tax bill through an amended tax code, received demands for payment of tax ignored them because I've already indicated I want to pay through my tax bill and this is automatic. Now I've been fined £62 for late payment? automated phone line keeps hanging up on me. now been on hold for 44 mins.... Can anyone on here help?

Hi GrumpyTaxpayer,
Please refer to the following guidance - Pay your Self Assessment tax bill.
Thank you.

Yes. This is what I did. Don’t worry rather than waiting four days for a response on here. I waited 1hour and 20 minutes on a call. When you then admitted your mistake and cancelled the fine. Cheers!