Residential Phone Bill...

Ok,got the bill today.My mother past it to me. *SHOCKED* The amount payable is $157 in total.My internet as usual is $70 while calling that part is $45.Who used them? MY DEAR BROTHER!!! He was calling his "bao bei" almost everyday so you know.My mother make me pay for it.Of course I have to pay,what to do.How much my brother owe me now?It is like $300?How is he going to pay ah? Have to control him in the next month.How to control?Maybe I will record his conversation for everytime he use. =X