Taking your money and no service

I appointed this company to assist with some labor issues. Mr Louw van Zyl was supposed to prepare when on holiday for 6 weeks in April/May 2023. On returning we had an appointment, which was cancelled on my way to his office. Since then I have been ignored for weeks on end with feeble excuses. In September I again gave him a direct instruction. A month later no response. Finally he returned my messages/calls by saying his laptop was in for a service. Surely he can see his e-mails on his phone as well or can at least let his customers know that it is difficult to reach him. He works on a retainer of R1800 for 3 hours per month or otherwise R600 per hour. I paid him R6000 on a contingency basis, didn't get my money's worth and he is not following instructions. I asked for a breakdown of the time spent on my case and want the rest reimbursed. No response again. How do I move forward?