Wrong number

For the last few days some woman from Japan keeps calling my cellphone.
I know it’s Japan because Google says +81########## is a Japan number and when she leaves a message it’s all Domo arigato Mr. Roboto crap.
Usually the call comes when I’m at work and it’s on silent so I see the phone display light up but can’t answer it.
Today I answered it after joking about it with someone at work to try and tell her she had the wrong number. Poor woman sounded so confused.