First of all, if you've not had the best experience with any Private show, try to sort it out with the model.
If this isn't satisfactory, contact Customer Support as soon as possible, with all the details and if possible, any screenshots you may have taken.
Customer Support will help as much as they can but would escalate it if needed. The model will be contacted and if she's with one, her studio would also be contacted.
You will hear back very soon after with information.