BAD payer

Deafualt on all payments. Client owes us more than R120,000 since Oct 2019. After appointing Debt Collectors and having discussions with them, even giving them some discounts, they still did not pay a cent. This after all work was done for them! If they could even start paying some amounts it would already be better, but no payments at all...while they are continuing business and having income to pay us.