I think ive got 15 days left of booster. correct me if im wrong. but they have just desapeared. no more booster enabled now. they didnt show up in my activated or deactivated items so idk... plz help me

Hmm...Maybe you bought a shorter duration booster.
Check this page to see if it's still activated.

nupe 1 month mobile booster :S:S idk if moth passed tho dnt think so...

I would assume that since you did indeed lose track of the time left, it probably has expired. If however, you still believe that their is some time remaining and that it has somehow vanished, contact either skulfuk or suomynona. Remember to only send one pm to only one of them with the information you have given here.