10-15 days isn't nothing to trip about. it's after a month & half you need to trip. alota mufuckas lie & overcharge for shipping. mufuckas will promise priority mail, & wait a week before going to the post office. then to top it off they send it media mail. that's why I recomend doing repeat business with people that do you right the first time. theres some good sellers, then there is some realy shitty ones.
anyhow if your tripping still, I suggest you send em an email. keep it to polit though, noone likes to deal with an asshole. I've even had a few people through in extra shit free because they slacked on getting shit to the post office.