Camping World bait and switch on repair estimate Chattanooga Nationwide

We called for a rough estimate on replacing the rubber roof on our RV. The make, model and length were provided. We were told it would cost between $2,500 and $3,000.  We asked for this information beforehand because Camping World is about a 115 mile round trip from our home.  We received a written estimate of $7,788 and were charged for giving the estimate.  We can understand missing the estimate by a few hundred dollars or even a thousand, but wanting $4,788 more is ridiculous.  We are out two round trips - hauling the RV there and leaving it for a week and now going back and picking it up. Camping World is truly a rip-off company.