Poor service

I have a problem with your billing on contracts devices. I received an email with the invoice attached which states "Pay on or Before 31 Oct 2022 R 336.04" and I paid R 340. 00 on the 19th of October to avoid the debt order. To my surprise my account was debited the 336.04 and I have another financial commitment that I need to pay and now I can't pay them. I have called more than 4times and the last consultant I spoke with "Laurence Stuart" we couldn't understand each other even when I give her the explanation. Do something about your billing because now I will fail to meet my other financial commitments because of your incompetence. Which will have a negative impact on my credit profile