Fidelity dismissing proof of payment and forcing me to pay twice

Fidelity is claiming that I did not pay the premium for Dec 2022. They are telling me this more than a year later. I went into my archived statements (which the bank is charging me for) and pulled out proof that I did make payment on the 23 Dec 2022. I got a response from them that they need to make a payment arrangement with me. Such disrespect! The audacity of a system error coupled with human beings who continue to treat me with such ridicule, claiming I have not paid even after providing proof thereof. I am appalled.