I just thought that my answer was slightly inaccurate. - 멏 번이나 전화했어 or 여러 번 전화했어 => I've called you SEVERAL times. - 멏 번 전화했어 => I've called you a FEW times. * "몇 번" is written with a space, not "몇번".

"I've called you several times". => 몇번이나 (너한테) 전화했었어. (emphasize "several times") => 몇번 전화했어. (more casual with no emphasis)