Very disappointed with disgusting services

Hello Peter ,I've app**** for fibre from MTN Supersonic on the beginning of August,I got my router 19th of August then they expect me to pay but the router wasn't active,so theyve send me an invoice that I have to pay 8/10/2024 ,I paid on the 3/10/2024 Wich means I paid before the due date ,on Saturday 12/10/2024 they suspend my internet and state I'm overdue ,I want them to switch on my WiFi plus a free month for the mistake they've made