Called our landline at 1.35 PM and some African sounding voice told me that my phonelne has lo of faults and engineers have found it. THe fiber line has toomany faults.

I told him we havecopper line and not fiber yet. I shouted and told him that I will direct this call to Australian Federal Police. He said he will also complain to police and cut the call.
I have heard that these scammers call from phone numbers which are out of service, someone from Telstra may be helping these scammers to use the line to scam people.