When I say "Sorry for bothering you" that means I'm still bothering you . But if it has just finished at the time of speaking but lasted for a long time shall I say "Sorry to have bothered you" or Sorry because I have been bothering you "

When I say "Sorry for bothering you" that means I'm still bothering you . 

But if it has just finished at the time of speaking but lasted for a long time shall I say: "Sorry to have bothered you." or "Sorry because I have been bothering you."?