what comapny is this?

they some type of so call phone provider somethimg like global communication or globalstar communication they keeps ringing me once yesterday and twice today straight after i finish with da first call of the day. the first one said tat i contract as expired with my phone company when i know it isnt. The second call of the day was saying i'm an every good customer of their company..... and i told her straight tat i'm not with your company and she started going on about u are with optus and i told her that my phone company isnt with optus it's with another company which uses optus. She wanted to know who i was going thru and i didnt tell her. I told her that like i told the other person who rang me about 2 mins ago tat my contract isnt up and if they keep calling me i will have them for harrasement..... and hang up on them..

Anyone knows who this is?