I have consistently paying my subscription a few days early, but for the last few months, I have been receiving email notification that my service will be suspended because of non payment

I have consistently paying my subscription a few days early, but for the last few months, I have been receiving email notification that my service will be suspended because of non payment. I now have the responsibility every month to convince Rocketnet that I paid while I do the payment on the portal. This is extremely frustrating that the system does not work as intended and no reasons are given for this...only an email saying that I successfully paid after struggling for days...