Incorrect billing Mess, NO HELP.

Not happy. Had my FLTE R999 downgraded to the new R499 uncapped FLTE package. This was to take effect on 1/05/2022 and i was assured i will be billed R499 going forward. Now of course as expected with supersonic i received a bill "Before" the 1st of may for R999. On more than 10 occasions i sent emails and Facebook communications and was assured this will be corrected. Its now more than two weeks the new package has taken effect and thats the service i have for may R499. But still the R999 bill for my PREVIOUS package has not been cancelled that clearly states is for 01-05-2022 untill 31-05-2022. That bill should be cancelled and invoiced at R499 as that is the service i have from 01-05-2022 untill 31-05-2022 going forward. I ask you one final time to correct this bill now stating i owe R500 as i made a payment for R499 that is only what im supposed to pay. I expect a credit as soon as possible for this R500 i was overcharged with, if my services are going to be disconnected for bill im not due to pay im saying Goodbye and going elsewhere. As i say i made a payment for R499. The rest showing outstation should be credited as that incorrect bill was generated before my new package took effect. Thank you