Caller would not respond when phone was answered

Just got a call from this number rang once and hung up

I called the number back, this is associated credit services, its a debt collector for the hospital, bad enough I have been dealing with being diagnosed with cancer and going thru treatements now the hospital is sending my bills direct to the debt collector right off the bat rather than to me. I refuse to pay debt collectors. I will pay the hospital itself when I am done treatments.... thanks UMASS!!!!!!!

UMASS sent my bill  to me AND the debt collector at the same time.   Two days after receipt of the bill I started reciving calls from 774-314-4295.  I too refuse to pay debt collectors as my bill was not even due yet when the first call came in.  GET A CLUE UMASS!!

phone rang from this number, I answered dead silence on the other end...I have no idea who it is...