Who isn’t doing their job?

I am at my wits end. I have been handed over to Blake & Associates, due to non payment on my Makro account - 100% understandable. However, as I am currently under Debt Review due to my financial situation, they are supposedly to contact Debt Busters directly to liaise on a solution going forward but they refuse to do so. I am getting daily calls (after me requesting multiple times that I cannot answer my phone during the week due to my job). They then say no, I have to personally send them my Debt Review forms, which I have sent, via WhatsApp over a week ago where I received confirmation of receipt. However, I still get calls saying they didn’t receive it. Who do I have to speak to in order for me to get these forms sent where they will actually get this matter sorted? I am sick of daily calls when the work doesn’t actually get done. If it was that we weren’t sending the documents and trying to get this sorted, fine I would understand but this is their negligence. Am I supposed to go to court as I am pretty sure that I read they only have a number of days to get this sorted? Any advice would be helpful?