Who called from 3603835932

Called at 7:00pm but did not leave any message.  This is one of a series of calls with no message from this number.

I received a call from this number today at 10:30am.  They said that they had serviced my furnace last year at this time and so it was due again, could they schedule a time for this year's service.  Fishing to find out when I'll be home?  Asked about morning and afternoon availability.  When I asked for their phone number so I could check my furnace and return their call, they hung up on me.

Called at 6:21 p.m. same as someone else mentioned, 3 seconds of static on voicemail.