Continuous taking back with the same problem

I purchased a Zodiac Chrlorinatior and have been experience endless problems with said product. I have taken it in to be repaired numerous times to Waterlink Pool and Spa who are representatives of Zodiac. While it was under guarentee it was one thing, but then the guarentee expired and we are still encountering numerous problems. On the 2nd of March 2015 I took it back in to be repaired and collected on the 12 March 2015 and yet again it continues to be faulty. I was made to pay an amount in excess of R800 for the repair. I find this to be unacceptable, considering each time it becomes faulty, I have to take it back in at my own expense. The amount of money that we have spent on the chlorinator is totally ludicrous. With any other purchase that I make, whether big or small, once the guarentee has expired I do not encounter costly problems that occur as is the case here. It is obvious that the name Zodiac is now of inferior quality.