caller said nothing

I just received two calls from this number. The person sounded like he was far away and he also sounded foreign and I couldn't make out what he was saying.

Today.. i got a call from (416) 555-7777 i picked up but there was no sound. then 2 minutes later they called again and i picked up but no one talked.. they called 4 times...whats up with them?i called back but it said the number was unknown..how did they even get my number??im confused!

automatated phone call saying my debit card had had a security bleak and I needed to file a complaint immediately with them.  It then asked for my 16 digit debit card number.  I put in all 0's but it wouldn't let me any further.  I decided to hang up at that point and look it up on the computer.

also received a call from this number

Yup, I just got a call from a heavy accented man...caller ID = Spider Spider and he claimed he was from Bell Mobility.  He sounded like he was calling from a cell phone, on the highway, with his windows down.  It was so noisey.I just said I wasn't interested and hung up.  He is not from the GTA area...no way!