Uber and Discovery Bank is the dog box

Uber and Discovery have a nice little "don't respond d to cistomers". I am 72 years old and I was confused by an Unver message to sign up for a new food service. I hit the wrong button and have been trying to get Uber to reverse it. They have now twice debited my account. Discovery bank provided an email address that does not work. I then tried altering the address and got a reply on one from Uber telling me it does not work but not giving me another email. But not a new email. One thing both Uber and Discovery don't like is email. It give the customer a record of what is happening. So much for customer services. Uber must remember that it has competition and should stop trying to pull fast ones