TV LICENCE PAYMENT MADE, THEREAFTER REQUESTING AN ADDITIONAL AMOUNT THAT WAS NOT COMMUNICATED

On the 26.5.2020 @15h11 I received an sms advising that I need to pay arrears SABC TV Licence which I had forgotten to pay in the amount of R503-50. I have been extremely busy and managed to get to the store yesterday 9.6.2020 @ 14h02 and made payment in the amount of R504-00. This morning I sent them a whatsapp advising them that full payment has been made and someone then advised me that the amount is now R530-00. I then sent an email and advising that the full amount has been paid and was told that on the 2.6.2020 the an additional amount of R26-50 needs to be paid. If they are aware that the amount has gone up, the onus lies with Revco to ensure that communication is sent out timeously to ensure that the payee pays the correct amount. I cannot now be liable for an amount communicated to me week later, when the amount had increased on the 2.6.2020 and communicated to me after I had made payment on the 10.6.2020 @ 10h20 and payment was made on the 9.6.2020. I am a research and often seen these incidents, only to be experiencing it myself. Then I was also told that I need to make the additional payment within 48hrs to avoid any penalty fees added to the account. THIS JUST NEVER STOPS! I WOULD APPRECIATE A CALL FROM THE MANAGER TO SORT THIS OUT ONCE AND FOR ALL AS I HAVE NEVER HAD ARREARS PAYMENTS AND IN THIS SITUATION WHERE I HAD FORGOTTEN TO MAKE PAYMENT AND WANT TO SORT OUT THIS ACCOUNT, IT KEEPS COMING BACK WITH DIFFERENT EXCUSES! Angry client!!