Bf3 downloads/updates won't complete

the caption says it. so today (4.12) aftermath came out and i just couldn't download it.
whenever it reached 99% it'd just jump straight back to 74% again and again and again.
after 5 long, frustrating and nerve wrecking hours aftermath finally installed, but i couldn't play it. whenever i launch it it will give me a black screen, with a flickering "loading" at the bottom left, and that's it.
repair install? yeah, alright. it said 30 minutes, took 1 hour, and again, reached 99% and jump straight back, this time to 30%.
this happened in armored kill as well but at least the expansion worked in that case.
i just want to say that i am tired, frustrated and pissed like a raging bull, and all i want is to play this stupid game i payed so much for.
quick replies will be welcome.