Disappointed with after sales service

Not impressed. We purchased an expensive pool cleaner from Zodiac. Our motor turned out to be too small to utilise the cleaner. Upon contacting Zodiac, they dispatched a technician who made this deduction. We requested that they perhaps help us to swap our cleaner for a smaller one, apologising too for not being pool experts. The technician told us that nothing can be done. We asked for the manager's number. The manager promised to call after the weekend. We are still waiting. We are very disappointed.