Star Tint

I walked into the business on Friday and was quoted a price of $400 to tint my vehicle. I was asked if the vehicle had tiny on the windows and I told them it did. Brought the vehicle in on Monday to have the tint installed. The guy came out to my vehicle to look at it and then said it would be $420. Several hours later they called and said they would be charging an additional $100 because the vehicle had tint on the windows. I told them I was super unhappy about this as the price had already changed. They said they would finish the job for an additional $80. This seems dishonest to me and I will never take another vehicle to them nor will anyone I know.