Car following me home

Just popped down to Bunnings to get a few things. On the way home i noticed this car following close behind me. Pulled into my garage and saw that he had his phone out either taking a picture of me or recording while i was in my garage. Not sure what i was doing wrong.

Drove after him for a bit so i could ask what’s up, but he just kept driving.

I got the rego but is there anything police can do about this? Been on hold for a while.