Who called from 9543206548

Called my cell a half hour ago, but when I try calling back, it always hangs up on me.

Called, I answered, after about 20 sec it hung up.  Called, immediately hang up. No answer to text.

Same as above - they called i answered said hello twice and then they hung up.  May be looking to see when you answer the phone so the next harrassing call can happen at that time.

Firefighters club, problely asking for a donation.  I hung up before getting to that part