Me - "Ok so to get your months free premium you have to be on direct debit. We have you paying by cash. If you chnage to direct debitm, you get a months free"

Stupid Customer - "Oh ok, yeah, I want the months free. So Ihave to go on direct debit to get it?"

Me - "That's correct. So did you have your bank details with you now? If you do I can set the direct debit up and you can get your months free"

Stupid Customer - "Yep, hang on a second"

***I wait for about 2 minutes, he comes back***

Stupid Customer - "Ok I just made a payment with my credit card. So when will I get my months free?"

And he was serious as well.
What a dumb f**k.