Paid account yet every month since April last year my phone is suspended.

I have been having a number of issues for a very long time now. Firstly every month my phone is suspended. Which happened again on Monday and now this morning as well. My account is paid before the due date each month and yet each month it is suspended. In the beginning I asked why my statement is always showing R1598.02 owing, I was told that it is the following months bill added. As due would show R799.01 to be paid. Which didn't make sense to me at all. Now I am told that my account is in arrears as I paid in March for January? Please explain where that reckoning comes in? When one person tells me it's the next months bill and another tells me I pay in march for Feb and April for March. Now I am 2 months in arrears. I went from pillar to post even making an excel spread sheet from the time I took an upgrade. Keeping in mind that when I did the upgrade my account was already finished. My account ended in May 2019 and I upgraded in July 2019. Already on a month to month billing system. Suddenly my account balance started with an arrears amount? I was tired of explaining my issue and paid the R1598.12 on the 1 APRIL , yet my account is still suspended 5 April. Called in had it opened, was given a sorry excuse of it was a public holiday and the payment still doesn't reflect. My argument , if payments doesn't reflect due to public holidays and you have no idea if perhaps the clients have paid. Why suspend the phones?