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You probably need to start all over again with these beds by digging them up and killing off the crabgrass. You can divide your vinca and plant clumps of it elsewhere, or take cuttings and root them in preparation for replanting. You can harvest the seed pods and store the seeds for spring planting.

Here are some helpful articles:
https://www.gardeningknowhow.com/ornamental/flowers/annual-vinca/growing-annual-vinc seeds.htm
https://www.gardeningknowhow.com/garden-how-to/projects/rooting-plant-cuttings.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/propgen/dividing-plants.htm
and, finally:
https://www.gardeningknowhow.com/plant-problems/weeds/crabgrass-control.htm

There is no way to get rid of them, permanently. Unfortunately, keeping them away will require occasional maintenance, as you have been doing.

The way to keep it away will be to remain on top of the maintenance. This will mean killing them off as they appear, which will reduce the seeding, and ultimately, reduce the number of volunteers that come up.

Here is an article for more information on the types of herbicides that will work well for this grass:

https://www.gardeningknowhow.com/plant-problems/weeds/dallisgrass-weed.htm

We don't make product recommendations, but I prefer the pre-emergent granules that are easily applied with a spreader.

We don't recommend specific products, but any selective herbicide for crabgrass will contain the same ingredient responsible. Here are some articles that will help:

https://www.gardeningknowhow.com/plant-problems/weeds/crabgrass-control.htm

https://www.gardeningknowhow.com/plant-problems/weeds/boiling-water-and-plants.htm

https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm

Since you missed the preemergent, the next best thing is a weed killer specifically for crabgrass and other grassy weeds. Some products claim to kill both grassy and broadleaf weeds.
https://www.gardeningknowhow.com/plant-problems/weeds/crabgrass-control.htm

Crossbow does not list crabgrass as a weed it kills. It is more for broadleaf weeds and poison ivy. Roundup kills grass and everything so I hope you only used it in gravel.
Use a product specifically labeled for crabgrass and other grassy weeds. You can use a preemergent in spring before the crabgrass germinates to prevent its growth. Then if it still shows up, you can use the postemergent specifically for crabgrass.