making payment's on hospital bill, but they still sent me to collection's can they send you to collection'seven though you are making payment's?

Question Details: I have been making $50.00 a month payments on my hospital bill.They called and want me to make arrangements to pay more, I told them I can't afford what they want me to pay and I would continue to make monthly payments and when I can afford to pay More I would. They keep calling and trying to make payment arrangements and my statements say if I don't pay in full I will be sent to collection's They are not willing to make arrangements for me to pay what I can afford,it has to be their amount or go to collection's I thought if you make an effort to pay you cant be sent to collection's Important Notice