ATT threading to send me to collection even though i am paying dept monthly

Hey There,

i was told by an agent that if i cancel service, i will not have to pay any cancellation fee. unfortunately, it didn't work out as he said; but that is an old argument. my concern he is that. i keep receiving mail from ATT threading to send my account to collection. i have been paying monthly and i even told them that i don't have that full amount now but i will pay it full in 6 months. one of the representative let me know that after 60 days, it will go to collection, another one said that it is fine if i pay any amount monthly. 

Right now i am confused. are they really going to send it to collection?

Thank you