Dominator and Kreepy Krauly Shocking service

Bought a Dominator Pro at The Pool Shop Durbanville 12 months ago. It worked well for the first 11 months. Then it slowed down and just gets stuck in the corners. It a brand new pool with an over sized pump and I maintain the system. The pool shop first tried to blame my sand filter, then the pump. Eventually I borrowed a MX6 from a friend and plumbed it in - worked flawlessly. Went back to the shop and told them to fix the piece of ****. a week later I get a video back that it is working in their pool. Put it back in mine same old troubles. Pathetic product with even worse after sales.