A bit of added advice... since you've posted this in the H&G section this will apply to almost any estimate you receive for home repairs or services. Don't be reluctant to ask or demand, if neccessary, a written estimate, stating services to be performed and cost. I'd be willing to bet the price of a cup of Starbucks (tall, room for cream, Guatemala, $1.54 here in the U.S., please) that you simply asked for the estimate. It's always advisable to have the piece of paper in your hand when the provider of the service comes back and states the final bill will be 25% higher because of.... whatever...
Best of luck with your carpets!