A court may pierce the corporate veil and disregard separate legal personality where fraud, dishonesty or improper conduct is present, particularly where a party uses a company to frustrate service of process and the company does not exist as a functional entity outside the individual. In rescission applications, willful default occurs where a party deliberately ignores court process with full knowledge of service, and courts will refuse rescission where the applicant has designed a strategy to frustrate service, has no bona fide defense, and has no prospects of success in the main matter. Service effected in terms of rule 15(13)(i) by leaving process at the premises where the defendant prevents service or cannot be found after diligent search constitutes proper service.