Advice on how to protect against contextual traffic

[FotNot420]

I've been running an online store for a while now, and I've recently noticed a significant increase in irrelevant traffic coming from brand-related keywords. It's really frustrating because this kind of context traffic doesn't convert into sales, and it's just wasting my advertising budget. Has anyone faced a similar situation? How did you protect your brand from this kind of unwanted traffic?