Invoice error on rain

Im a bit frustrated with rain. For the past few months my invoice has had an extra 499 on it. I called twice already to get it sorted cause a consultant claimed that i owed them.which i know i didnt. untill now i had not defaulted on payments.fast forward to 2024 i missed two payments cause im on maternity leave and couldnt pay but still that extra R499 appears. Its worrying cause i owed R998 not R1497.iv paid R499 now and the balance now states R998.please fix the invoice issue cause i cant pay an extra R499 for something that i dont know