Hi Sigma, you answered both their question but leaving mine unsolved.
My condition is added more campaign but CI doesn't go back to 80. It was some sort like a penalty for cancelling a campaign??
I believe the penalty for cancelling a campaign is just money wasted for that week. It does not hurt CI, if you replaced the campaign with a more expensive one.
It seems the way it works is that certain amount of money spent on marketing buys you a certain level (amount based on your airline, your routes). If you look at week over week changes and if it is inching up, it will keep going up until it reaches the new level. It can be extremely slow, especially if the different levels are not far apart. For example, if you are at 80 and you are spending money to buy you CI of 90, it will take time, and weekly changes will be small. If you are at 10 and have bought what would be level 90, it will move very fast at start, and then it slows down as you are reaching 90.
If it is not moving up at all, you are either not spending enough, or there are other things that are reducing your CI, such as delays, cancellations, old aircraft etc.