Why does my phone play random ads?

[AC Question]

Last week my HTC 820 desire G plus, just started playing an ad that starts with "the kind of air that comes out of her..." it sounded Ghanaian. So I began looking for where the audio was coming from to no avail, I noticed an icon at the top of my screen that looked like a coil pop up as soon as the ad started and when the ad ended it disappeared. This is the second time in a roll this has happened. Please can someone explain why this happens and how to stop such audio ads from recurring?

 

[B. Diddy]

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