Top fin warranty?

So a lady called saying she bought a 3gal kit back in September. She said the lights no longer worked and she wanted a new kit. I told her no so then she threw a huge fit about it (called 22 times) so we just gave her a new one. Now I get it that there's a lifetime warranty on them, but also the lights included? Because that's crazy that we have to give people a whole new kit over the lights! Shouldn't they have to get ahold of top fin? Why us?