Beyond annoyed.

I am beyond frustrated with this institution. They have put my credit card in arrears when I paid on 18/12/23, I called Client services on the 17/01/24 to confirm the messages i keep getting amount an outstanding amount. The agent advised me because i paid on the statement date they cannot see the payment as yet and not to worry abut it the payment will reflect for January. I than received three calls from collections about this payment. All the agents advise they will escalate but they never do and no one seems to be able to see the notes from the previous call. When you call their ****** call center, you advised they have technical issues and the call quality might be bad but THEIR OWN AGENTS get irate because of the quality and they are rude as hell. The agent i jsut spoke to now just made it worse, She gave me attitude and basically said the double payment i made was allocated as an extra payment for November and their system does not care how much I pay in a month as long as i pay between 18-24 of the month that will be credited to the previous month i should have read the contract. When i asked he to call me back as she took my airtime setting up security query she said she will not, i have to get more airtime and call back. I have never been so angry with something as simple, Woolworths owes me an explanation as i have never not paid my amount. How can i not be allowed to make advance payment on an outstanding? Who is gonna credit me for the calls i have made+ time spent and misleading information your own people provide.