Aggrieved by the TFG accounts department

My Donna Account is becoming a nightmare to manage. All these years I've been paying via EFT with no hustles but now I get calls every week to pay my account, as their records show that I haven't made a single payment in 2020. I have emailed proof of payment so so so many times but my payment does not get allocated. I have emailed to ***, *** and *** So many times I've lost count. They don't even acknowledge my emails at the least so that I know someone is working on my account.

Can Someone at the Accounts Department please allocate my payment. The collection agents have runout of excuses to tell me why my payments are not allocated.