Muslim woman whose kaafir family celebrate her birthday


My parents and two brothers are kufaar (they have no religion) and they insist on making a big deal on my birthday (by phoning me and e-mailing birthday messages and saying ’happy birthday’) even though I told them many times before that I do not celebrate my birthday and that it is just another day like the other days.
(I am the only Muslim in my family and married to a Muslim and I live in another province in Canada away from them so they are not close to me). This year I unplugged the phone on that day so I could avoid the issue.
What should I do?