I had similar experience as other complainants - got 5 strange calls in ten days all 305 503 but last four digits varied - 3540, 3518 and 3526. only spoke to unknown nasty male & I hung up immediately. I will block all these numbers. This is very creepy.
For the past couple of weeks ive recieved about 5 calls a day from 16, (305) 503 numbers with last 4 digits being different. When i call back a record comes out saying these numbers r disconnected. It is so annoying having to check out ur caller id every 5 seconds.
If you do a reverse lookup you will find Paetec Communications - you should call them and ask and see what is the purpose of so many calls. Today was my second call and it is very very annoying