Financial department is falsely accusing me of missing a payment, albeit all my attempts to send them the proof of payment.

I am being accused of skipping a payment on my account (my payment of 1/03/22 is not being reflected). I have emailed the proof of payment on numerous occasions to both Woolworths and Nationwide. I have had numerous telephone conversations with the call center that contacts me (spams me!) re this and they are not able to resolve it. I have been into your store, where customer services is not able to help me.

I do not know how else to resolve this false accusation, as there is no other contact available except for the addresses that I have already been mailing and receiving no feedback. I am desperate, please assist.