Unclassifiable CIN

Hi I was sent for a smear which detected mild abnormal cell changes. I had my colpscopy biopsy in June and the results have came back unclassifiable cin. I have tried to get through to have the explain this to me as they have arranged an appointment to discuss treatment in September but I was unable to get hold of anyone. I am fortunate to work in the health service and was able to ask a gp I work with but she was unclear about what this means. Does anyone have experience of this and could shed a light on this for me?