Billing an issue Sin e Nov and never accountability

I am so angry and we are at our end. Rain's billing does not make sense and their non professional call centers. I want to really swear right now. They dont call back, you hold for over 40 minutes. They cost you more than the time needed. Me called them on Saturday, because the billing made no logical sense but we agreed on a payment of R527.03 as recorded line. Suddenly we now must pay 625. I am going for another service provider. Since November last year, I have been having issues with Rain. Run away from Rain.