When I have not? Small problem, I know. But they have completely ignored my not changing my surname on marriage. I have told them repeatedly I am still known by my original surname, but they refer to me as "MrsTheirSurname", send me letters addressed to MrsTheirSurname and have forwarded invitations sent to their address for DH and me, scoring out my surname and replacing it with theirs.
On challenging them, they told me "If you join this family, you take our name. Its not up for discussion". Except I haven't, and I'm not going to.