The sales department team which consists of four employees, three of whom spend much of their workday outside of the office working with the clients

The sales department team which consists of four employees, three of whom spend much of their workday outside of the office working with the clients. All three employees have had a near-miss in the past in dealing with violent clients. On two occasions, clients who call in the office lost their tempers because they received answers they did not like. Several times the employees who conducted their business outside the office were the targets of threats and aggressive behaviour. The employees reported this issue to their sales manager. This issue was discussed during the management meeting. The answer you've got was negative; in fact, they don't think it is necessary to have such a procedure. What OHS regulations need to be met? What actions do you recommend mitigating workplace violence?