Bad Service.

I Changed my debit date after payment for the month on my credit card account via the app, during the same month l get debited again flip l call in to find out was is going on l was told by three different agents the nothing else they can do the only l can do is to send myself the money back into my debit account then l ask them what about the interest that comes with that no answer l guess the number of zeros you have in your account determines the service you'll get...