Overcharged by UberEats - Do not use their vouchers!!

UberEats and Uber in general have a terrible web experience and ordering food from the UberEats site is a really horrible experience. But most worrying is that Uber overcharged my for my last order, where they used the vouchers I had loaded onto my account for the order, but at the same time billed me the full amount on my Credit Card instead of just charging the overage of the voucher value to my Credit Card. Do not order from using vouchers!!