Best Filter Changes in Phoenix AZ

First pool company I hired, awful experience. Called in to have my pool drained and filled. Talking with a rep she mentioned 1.5 days to drain, next day 1.5 to fill and than balance the water the next. Which will be a 4-5 day process.. They had a tech come out and just dropped a pump off and left, said he will be back in twos days. 4 days later, no tech. So I decided to acid washed and filled up my pool and balance the chemicals myself. 5th day the tech came and picked up the pump and just left. Few days later they sent a supervisor to come and balance my chemicals, which I already done. I mentioned to him about what happen and how I was not satisfied with the service and promise of 4 days, that turned to almost 2 weeks and I am not paying for a service that you didn't really do, he just said ok, your water is good and left. Than few months later I get a bill saying I have a past due amount. Past due, for what service? The one I had to do myself. I'm not paying them, if they decide to send my bill to collection I rather settle with them than give any money to poolman.