Displeasure with Yahoo email

I am extremely dissatisfied with the Yahoo email web-based app.  It is littered with advertisements.  I do not recall seeing this fact mentioned in any of the notices about the migration.  I am paying for my email accounts as part of my Cox bundle and do not wish to pay another $5 a month to Yahoo to turn off their ads.  I pay several hundreds of dollars already to Cox each month and deserve the same service that have received for the past 12+ years.  I find this very shabby treatment of customers who deserve better.