There are probably several ways to accomplish this, but this should work--use an Add New Data Element towards the beginning of your main model, make it an integer, and set the value to 0 (let's say we call the new variable Counter). Then in the decision model within first escalation, use the Add Values component to add Counter with the constant value 1. This will increment your counter each time the escalation is triggered. Then put in a number range rule to check and see if Counter is less than or greater than something like 3. So if it's less than 3, it will go down the path of sending the escalation email. If it's greater than 3, it will not send the escalation email (it will go straight to End).