Absa harassment of debt review client

So I've been with Absa since leaving school. I've been under debt review since 2017, they've messed up my cheque account which was paid off, now has a balance larger than when I started debt review. Now I'm being harassed multiple times a day as they've terminated my debt review. I've got proof that my installment is paid every month but somewhere they've messed up again. My administration has been in contact with their debt review department but they don't know how to fix their own mess and the person that was dealing with the issue has just disappeared. Absa doesn't communicate with the administrators. Needless to say that they won't be seeing me once my debt review is over. Hopefully someone from corporate sees this and can sort out my issue once and for all. Legal action is looking like the only resolution right now.....