I have few phone call with different 4 last digit number with the same first four digit number +659005 xxxx. Below are number calling me in one after another for the same day in 16 minutes I have 5 phone calls : +65 9005 8860 +65 9005 5025 +65 9005 0886 +65 9005 4439 +65 9005 7633

If anyone know who this phone call are from, appreciate to let us know. Who would try to call multiple time with 5 different 4 last digit number if they are not scammer?