what kind of beads did you use? i suppose you are using them to isloate CD14 + monocytes for macrophage differentiation. Otherwise, it's not suprising to see dead T cells in your culture.
there's no real bi-week. they just ask u to pay them bi-week, they send money to the bank monthly, while keep the extra to make 2 more payment at the end of the year. are they doing this for free? no, so u pay them extra fee to let them do this on time. can u do the same thing by yourself? if no, u should go for bi-week.