Canaduct Duct Cleaning

Had Paul come out to fix our old dryer vent. Did what looked like a good job, but after 4 months, it split and came out of the wall (there was no dryer movement). I called to explain the problem. They told me that repairs only have a 3 month warranty. The work was done 4 months ago. I would not use for any repairs. Poor labor and/or materials.