3.03.05. Unless he has sound and reasonable grounds to the contrary, a hearing-aid acoustician may not cease to act for the account of a patient. The following shall, in particular, constitute sound and reasonable grounds:(a) loss of the patient’s confidence;
(b) the fact that the hearing-aid acoustician is in a situation of conflict of interest or in a context whereby his professional independence could be called into question;
(c) the fact of being incited by the patient to perform illegal, unfair or fraudulent acts.