Billing before salary date, without proper notice or reason

What is wrong with your billing system. How can you give want to bill me before my salary date?

Last time you said this "Vumatel's reply: 31 Oct 2022, 07:36

Good day We apologize for the experience thus far. Please contact your ISP for any assistance with billing as your service has expired the next payment was scheduled for 2022-10-27."

But yesterday I got these, the same time, Fly.cool payment reminder: You are due in 2 days. EasyPay ref ********************1 pay at PEP, PNP, Boxer, Woollies, EasyPay app/website"

"Fly.cool payment reminder: Your service will expire tonight, renew at PEP, PNP, Boxer, Woollies or EasyPay to avoid service interruption."

Before my salary date? And I sent you a message on Whatsapp again no response.