Immigration Consultancy Not Refunding Money, Even I Have Not Availed Any Service

I started a German Job Seeker Visa process and 100% job assistance service with Beyond Infinity Consultancy LLP on 18-Mar-2020 and paid them half the amount which is 23,600 including GST. After that lock-down happened and after that due to the current COVID situation, I decided not to go with the process. I have not availed any sort of services from them after paying the amount and I didn't even sign an agreement with them yet. When I asked them for a refund they are denying and saying that in self withdrawal cases we don't refund anything. Please suggest how should I go ahead with them and how much amount I can expect from them as a refund.