I created my account just to share that I found a way.

Context:

• My banner name is "bannerView"
• I load it with bannerView.load(GADRequest())

And looking through all the commands I found:

bannerView.removeFromSuperview()

and it worked like a charm!

Hope it's not too late and I helps!

PD: Keywords so people find this answer:

How to dismiss Admob banner AD in swift in Xcode

Remove Admob add from view in swift in xcode

Stop Admob add from showing in swift in xcode