I think we are both missing your answer. Perhaps you can repost it?

Please understand that we are commercial company and the advertisements is one of the method how to succeed on the market. We're glad that you paid for the better version of our antivirus after using the free version for so many years. But please understand that you did not pay for a version without any advertisements, but for version that provides more security.

The senior technical support supervisor is quite clear and official about why this is happening. There is no piggy-back issue. The spam is intentional.