Who called from 6788820887

I been reciving calls for this number   but nobody aswer

Call back gets rapid busy tone for about 30 seconds followed by disconnect.  No voice mail, no identification, nothing.  Clearly hiding. Clearly scam.  I'd block it.

Called this number back and get a recording saying the caller is not able to be reached.  Apparently they are a Verizon customer.

Nobody is on the line when I answer.

Did not answer