So we got metrofibre at the end of January 2024

So we got metrofibre at the end of January 2024. We got an statment of R580 for instalation on 31 January then on the 1 February we got a other statment of R499. So in 2 days we must pay over a R1000. Then in March I got sms that my account is not up to date, so I told them I pay each month round about the 20th. So they said I must Pay for the internet before I use it. This is the first ever that I hear you pay first then you can use it. Why did they then ask so much in January for less the 2 weeks use. Today I got home my internet is off. I waited over 40 min on the line for someone to help me. I send a whatsapp as well to them and tried their sosial media platforms like they advertise still no response.