First, of all call/email Uber asking for help and why your account was banned.
Second, never stack more then 2 cards at a time if its a completely new account. Take it slow.
Third, creating a new account does require a valid credit card and phone number. If you put a VOIP number Uber will not allow the order to go through, but you can always download a burner phone app and I believe some offer free trials. Or use a friends phone number.
Fourth, if you can't do any of this use a friends account. Theres many alternatives.