Sneaky Charges!!!

They claim you have 55 days to pay your credit card when you sign up interest free, i pay every 30 days and clear my card, it is not possible for me to owe any money even if the transaction is still pending but low and beyhold I see I have been charged every month interest on my card!!! Oh and they have been charging me to buy airtime off my app as well. You do not even get a notification every month to say your fees have come off, they are sneaky and under handed!!!!!