rec'd call on medical office business line - re student loans - robocall

Getting 5 or 6 recorded calls a day from this and different phone numbers.  They all want to help me with my student loan and they all use the same loan number.  I dialed 1 and asked where they got the loan number and he told me it was probably the wrong name on the loan.  I tried to push him more and he hung up on  me.