a man with an Indian accent called me to say that he is from singtel and they have detected abnormal behaviour from a third party accessing my internet which was slowing me down. my internet was indeed slower and then he asked me to check my router and how many devices were accessing my wifi. then he asked me to use my computer to run an application, while he was asking me to type in a command to execute a program, I told him that I would call him back as I was busy. he hung up. later I found out that it was a scam, if I were to have run the program, he would have hacked into my computer and stole my details.