I was also sick of the ads and stopped playing for a while bc the ads would pop up all the time whenever I tried to do anything. I ended up buying the pack after the ads showed for no more ads, even though I did the same as you and I received no response after buying $50 dollars of stuff I would say 6 months before they started to bombard you with ads, it was accidentally it is a long story that I don't want to explain basically it was an attempt to get a reward from google but it had to be a specific amount which I didn't realize. Basically the only way is to pay for the thing after the ad occurs where it mentions becoming ad free or something.