We are sorry to hear that you are having this issue. Ads should not show up in the middle of a challenge. Please submit a ticket to our support team. Please include as much information as possible.
What type of ad was it? what was displayed?
Where are you playing from and what device, iOS or Android?
What platform are you playing on?
This information will help us solve this issue. Once again we apologize for this inconvenience.
Thank you for playing!!