Don't panic, it's no big deal. A new shaft wouldn't be necessary. It's a very simple repair that can be done by your local cue guy while you have a beer or smoke a cigarette. Everybody has their own method but it's easy & quick for most. A new shaft is ok if if it's just something you want, but it's certainly not necessary. I know the dings feel huge & it's easy to imagine that the shaft is trashed, but you'd be amazed how bad of a dent can be repaired in just a few minutes.
The way I pull dents is with a paper towel & clothes iron. I wet a corner of the paper towel & lay it directly over the dent, then apply the iron to it. The dent pulls up in a matter of a few seconds & it's ready for flush sand & seal. I have seen other ways that work just as well. While in VF last month, I was in the booth with Lomax when he pulled a ding & I thought he was crazy with his method but it worked well & worked fast. Learned something new.