High Definition Solar Reviews

About a month ago, a salesman for High Definition Solar came to the house and started his sales talked. He said that in about 10 yrs or so, our electric bill will probably come up to a $1000 a month due to rising PGE rate. He computed our average monthly kwh usage which came out to 813kwh and then he suggested that we should have 2.8kwh solar system installed which would cut our kwh usage in half. I guess he knew what he was talking about so I did not argue but it cost me more than $28000. I wonder if he overcharged me big time with underpowered solar system. I am just wondering if the other solar companies charge a lot less than High Definition Solar. I have the name of the salesperson who came to the house. After 25 years, I won't still recoup my expenses.