Disappointed

I signed up with rain mid Feb and paid pro-rata. Sales consultant said asof 1 March R595 will be deduted from my account only to discover they took more than the amount I agreed to telephonically and as advertised. This is very scary as the have dug into funds that was meant to survive considering every rand needs to be counted in this days economic climate. I logged a million tickets yesterday and tried to get thru to billing who never answered as it said whole day, our lines are currently busy and logged callbacks which has not been returned, they silent. All I want is debit mandate confirming that they can allowed to take nomore than R595 and I also want my money back for the overcharge from 1 March which is owed to me now cause it was taken now