Best redialer?

[Android Central Question]

Android 6.0.1. I have to make a call Friday to a local number to "get in line" for a service they offer. Tons of people will be calling, and you have to keep redialing until you get through. Not sure if the number will ring busy, or give a "Please try again" message. Can anyone suggest a good auto-redialer which redials on a busy signal, and has other redialing capabilities? Maybe even be capable of redialing on "Please try again"? This isn't a "Robocall" thing, I only need to dial one number this way.