Irritating

Ive tried using this app many times. I was referred by a friend, and I was under the assumption that my first ride was free, up to $20. It said my trip would cost $9.59. This should have been covered by the promotion, but instead it still charged my card. Then Ive tried using it again, and now all of a sudden my card is invalid and doesnt work with Uber? Ive wasted so much time trying to get a simple ride using Uber. I really hope something is done about this. The idea of Uber sounds great, but in reality I have nothing but irritation towards it.

Shushssh about Uber, v3.239.4