Domande di colloquio per Customer Service Advisor presso Plusnet

Had a telephone interview, multiple questions about customer service with an emphasis on difficult customers. Seemed to go very well and was friendly and informal. A few days later I got an email saying I do not meet the minimum entry requirement for the role please dont try to apply again for minimum 3 months. If so, why interview me in the first place? And it would be good to know what these entry requirements are, as they are not described anywhere. Waste of time and a very poor experience.