Nope, as I stated before which you misunderstood, the throttling DOES NOT continue until the end of the billing cycle. It ends when you leave a congested tower OR the tower is no longer congested. AT THAT TIME, the throttling stops.
You are correct that the POSSIBILITY of ADDITIONAL throttling can happen at any time UNTIL the end of the billing cycle when on a congested tower, however in no way did I say that was not the case. The "throttling" itself, though, DOES NOT continue until the end of the billing cycle.