CRJ-900 Captain reported encountering wake turbulence on descent into CLT in trail of an A319.

Narrative

After receiving delayed vectors on the arrival into CLT; we were on track to VALL intersection at around 6700 feet where we had encountered the wake turbulence from the A319 ahead of us. We contacted Approach Control several times with no response due to the heavy traffic in the area. The wake turbulence generated from the A319 caused large bank angle corrections several times before I decided to make a right turn to a heading of 210 for the safety of the flight due to being vectored too close with the other aircraft. Once on the turn my FO was able to get a word in and we had our request approved immediately for the turn once we were already on it with no other issue. After several vectors we were able to rejoin without any issues and completed the flight.Cause: Wake turbulence from an A319 due to being vectored too close to each other resulting in an immediate turn to the right for safety of flight. No ATC response till after the turn. Suggestion: Keeping aircraft a little farther during vectors for spacing from each other to not encounter as much wake that could cause an aircraft to roll over.