rain soft price change

We had set up a appointment for them to come show us theri water softner. HA 4 hours later, After washing our hands and feeling the drifference I had to go to work and my husband said yes we'll buy it,$4992.00. The next day they came and installed it, I look down stairs and theres 9 boxes of soap and stuff. They gave us 4 years worth of soap and shampoo and ect...
I turn to look at the paper work and the price was not $4992.00 it was $5987.00. I right away called my husband at work and asked him about this,he said the sales man made a mistake and they instead gave us 1 year of salt. i called the sales man up and asked him is your salt cost $995.00 a year to use? He said oh no,then why are you trying to give me this salt when you made the mistake? he said well thats what my manger said to give you since it was a little mistake.Money must grow on trees for you sir. I still have college payments. Plus to make things worst they never got a permit to install this. Which out county you need a permit to install a water heater or anything like that.