Pay more for better service...
This is the ISP's prerogative, and the consumer's prerogative is to either accept this aspect of the service specification, go elsewhere, or do without. Sentiments along the lines of "I deserve Internet service free of such ads" are nothing short of entitlement mentality. We're entitled to what we're promised. We don't get to unilaterally impose service specifications on a business arrangement. Both sides have to agree, or the alternative is, again, parting ways.