I have built a propensity model, which gives out probabilities of a customer paying given a collection intervention using a xgboost model. The model has an AOC-ROC of 81% with an accuracy of 77% having TPR of 88%. I deployed the model to sort the calling list by the probabilities of a customer paying given an intervention. When I do a pre vs post analysis, there's hardly any impact of the model. Can anyone tell what can I be missing? Is there a problem with the model or something else is hindering the impact?