I received a call on 20 apr 2021 afternoon, he seems to have an indian accent. he introduced himself as calling from singtel technical department and asked if i faced any internet connectivity issue recently. i said i don't use singtel. although i had doubts about the authenticity of this call at this point, i listened on since i do experience slow internet. he quickly responded that the lines offered by other telco (e.g. m1, starhub, myrepublic) are all sub lines under singtel. he proceeded to mention he's calling because he noticed my internet usage spiked significantly over the last 5 days in my household and asked if i have any friends or family that came over. i said no and further mentioned that i have no internet line signed under my name, and asked if he got the wrong number. he repeated my mobile number and asked if this is my contact. i said yes but repeated that there is no internet line under my name. he then asked for the contact of the person who has the internet line. i asked - shouldn't he have the information from his database? after a moment of silence, he hung up.