As usual it is a voice activated call. If you keep silent for 15 seconds, call will be terminated. If you hello, the call will be transferred to an operator.

They will identify their name. In this case the operator call name was Kamarul from TnG.
He says their cawagan Perak has identified my TnG account was banked in money illegally @ money laundering.

The rest you can guess the similar MO, will transfer call to PDRM to assist and such.

Was working and no time to play with them.