PATHETIC SERVICES - RAIN

I upgraded from old router to a new router in July 2025 with Rain. From the start I asked them to deduct on 01st of each month. In the beginning was fine but all of a sudden they deduct on 25th of each month. Messed up came in April 2024. Since then I have endless issues with them. My payments was in advance. In July 2025 they billed me for old & new router, which is wrong. New router was activated on 28 July 2025. A credit note was done on 02/08/2025 which cancel out the wrong billing. But since August 2025 they try to deduct R1 138-00 from my account. I never promised to pay that old invoice. I have proof which shows that the old account is cleared with the credit note. But they still insist for payment. Atleast my new account the payment goes off on the 01st of each month. Whats so difficult to closed the old account. Please can someone sort this out. You cant buy a loaf of bread, eat it and go and ask for a refund.