Rain one frustration

I am using the Rain one 5G for a month now however 5G has no coverage so I'm using my 4G Sim. I get my bill this morning it says insufficient funds so the debit order didn't go through. I saw on the app my bill is R499 yet to my surprise this morning I owe R1058. Are they charging me both for the 5G that isn't working and my 4G? I tried to call their call center but they take so long to answer. I need clarity here.

Their info is so ambiguous you are left to figure things out on your own as a customer. It's sad.