A Qwest tech replaced a phone jack, will I be charged?

My internet was down for two weeks and after calling customer service numerous times for the past week, they finally got someone to come out to my house. The tech guy comes into my house and wants to check the phone jack that leads directly into the modem. I didn't realize that "checking" meant replacing the jack with a new one. Qwest's policy is that they give you the options of doing it yourself, hiring an outside technician, or having the Qwest tech fix it, but this Qwest tech guy just did it without asking and left before I can ask anything. He left without saying anything about being charged for the service, nor did I have to sign anything or do any paperwork that proves the work was done. I'm hoping he fixed for free, but I'm afraid it would show up in a later bill for +$100. Did anyone have a different experience after a fix?