Aspire E5-572G Charger giving AC output

I bought Aspire E5-572G laptop last week. Its charger is giving AC output. I got minor shock when I touched VGA port while charging laptop.

Charger is supposed to give 19V DC as output but upon checking its output with multimeter I came to know that it is giving following output:

DC: 19V

AC: 43V

When I reveresed the multimeter wires output is:

DC: -19V

AC: 0V

Please tell me why it's giving 43V of AC current as output????

Is it safe (for laptop) to use?

or

I should contact customer care??