Main broadcaster of all this is BLUE LABEL TELECOMS. They gave out nr's for all companys like miway , mtn , cel c , Vodacom to call clients.

011 523 3030 - Blue Label Telecoms - 75 Grayston Dr, Sandton, Johannesburg, 2000

Answer no talk

I missed the call and called back. A voice mail said: "Sorry we missed your call. We'll call you back later." Feels like a scam

I called back number 021 895 0021 reached voice mail but did not say for what company.

This number is calling me every 5 minutes and it's irritating me

This no called me just now but I didn't pick it up, who's this?

I phoned the number 15 minutes later, then it took me to voicemail.

I called back number 021 895 0021 rang once then gets disconnected automatically.