Absolutely not, one thing many insurance companies do is try to convince their customers that they need to receive two or three estimates from different body shops before they will pay for any repairs. There is NO law that states this, in fact, there is one that states that you have the right to have your vehicle repaired by the business of you choice.
Don’t run the defroster, heater or air conditioning on high settings. Avoid parking the vehicle in the direct sun. Rapid changes in interior temperature or prolonged exposure to sunlight can stress and weaken the windshield. Get in to Thiel’s for repair as soon as possible.