Interest on judgement account

I apply for debt review which was allowed by a judgement order. Nedbank allocate the account to one of consultants according Nedbank when l call in for statements and they gave me this consultant details but he never rep**** on email or answer my phone calls. At the end of the day Nedbank informed me they handover my account to HP Attorneys. So when l call Nedbank for information on this account they told me they don't deal with this account anymore the attorneys control this account. Anything l wants to know the attorneys must give me answer. Since I started to debt review there was never interest added to this account and according the bank they don't charge interest for judgement accounts. The attorneys and me have an agreement that l will pay R800 a month which l did since day one of the agreement. Recently l requested a statement and see that interests of R1057 will be added every month. So l call the attorney they tell me they Assume but can't tell me straight for what is that interests So what's happening here I will never paying finished because of this interest which they can't explain to me I feel they penalize to much on this account that's why there is no movement on the account. So can you please get Nedbank to explain to me because the attorney can't tell me about the interest