Missed Call, No msg, Tasmania?

these people call me all the time to change my electricity supplier .. I have told them time and time again I am fine with who I am with - I told them this on Friday and advised I am working and to stop harassing me at work - and I just now notice a missed call from them again right now at 10.45 whilst I am again at work - im going to flip my damn lid

No message left...could be telemarketing