What are the chances of me being able to switch back to sero Oct 1st

[Jok3sta]

ok I ended up ordering my epic yesterday and got the 59.99 plan. I was on the sero 30 account. I have 2 lines with the sero 30 ( now just one ).. The rep I talked to said i should be able to switch my plan back to sero on oct 1st but she didnt sound too sure about this.. She said my plan wont be changed until i activate my new phone.. Im starting to have second thoughts though.. What are the chanced of me being able to switch back to sero. I will still have one of my lines on the sero 30 so will that be my leverage? Im thinking of just cancelilng my order and waiting it out. But I want this phone SOO bad. what do you guys think?