Uber — Not allowing promotions

Address:	110030
Website:	www.uber.com

Uber is running an offer with MasterCard for every 4th ride free. However the free ride is not given to me by uber. When I raised the issue to uber they repeatedly said that I am not eligible for any promotion since I have voilated some condition, what condition that they don't know. The offers are continuously appearing in my login and when I am availing it they are denying. If I am ineligible for any offer they it should not appear in my login. It is a clear case of mis-selling. Further, uber people are not sharing the exact reason why I am not eligible for the offer. They are just fooling customers and nothing else.