'You don't not call me' from House of Cards season 1 episode 1
I found only this part on the internet.
Claire who is Frank's (Kevin Spacey) wife wanted him to call her back but he didn't.
And then when Frank is home, she says 'You don't not call me. Not when it's big'
The Conversation is below:
Claire: You didn't call. You didn't call me, Francis. Nine hours. You don't not call me, not when it's this big.
Frank: You're right.
Claire: When have we ever avoided each other?
Frank: I wanted the solution first.
Claire: Do you have one?
Frank: Not yet.
I think it should be 'You should have called me'
1. I would like to know what exactly 'you don't not call me' mean here.
2. Why does she use 'present tense'?
3. and the reason she is using 'double negation'