Woolworths Missing Payment

I have been going through the worst experience ever with Woolworths regarding my store card account. I made a payment via eft on the 21 December 2020, was ill in bed at the time so could not go to the store as I would normally do to make payment. I made an error on my side with the last 3 digits of my reference number. I have had numerous calls stating my account has not been paid, I sent proof of payment together with my explanation of an error on my side with the reference. I have been promised time and again to get a call back to sort it out. I went to the store directly, proof of payment was sent from the store to missing payments, I have a reference number from the store and was told it will be resolved within 7 days, Two statements later the payment has still not been allocated. I tried calling numerous times as well to get feedback but can never get through to accounts. This is now highly frustrating as I am being charged interest on an account which is not in arrears. My account has been handed over to Fusion credit for collection when my money is sitting in Woolworths bank account and noone Wil assist in getting this rectified. I want to settle this account and have nothing to do with Woolworths afterwards but cannot settle due to the payment nor being allocated to date. I cannot understand how such a huge company can be so unprofessional.