Chase Credit Card disputed charge

Chase failed to conduct an adequate investigation after I disputed a fraudulent charge. They reinstated the charge before they had received the Affirmation of Fraud they required me to complete. Their denial letter offered no explanation as to how/why they had determined the charge was legitimate. There is no question the charge was fraudulent. Chase will not respond to my repeated requests to have this reviewed. I am being regularly contacted by Chase's collections department, who are uninterested in my dispute and unwilling to help get the issue addressed.

If something like this happened to you, please contact me.