Daly credit corporation unprofessional

When my account got handed over to these guys, I owed R16500. Made arrangements to pay R500 monthly which I being paying for last 6 months. Called them last to check progress of account since I have never gotten any statements or calls regarding account. Agent to told me I now owe R22000, this came as big shock to me. I asked how account went up instead of down and she its cause of interest charged for calls, sms's and statements. That sad part is I have never got any calls, sms's or statements from the company but they can tell me they charging me for it, I feel like this is *****. I wanna take this further with NCR.