MTN Home Premium WiFi

I app**** for MTN Home Premium 35Mbps wifi in November 2024 and paid an upfront payment of R582.16 on 26 November 2024. I received the router on 4 December 2024. I received an invoice in December for the amount of R866. His was for January 2025 and February 2025. I paid this amount but now my services are suspended, because I haven't paid for March 2025 which is due today 04 February 2025. How can services for February 2025, which is PAID IN FULL be suspended because the subscription for March 2025 is not paid? Only MTN South Africa can answer this question for a service that's supposed to be month to month. MTN has the worst customer service I've experienced in my life.