Problem:
Reliable Fence contracted with Rita and Mike Henderson to install fencing at their home on at 316 Adams Drive. Installation was scheduled for Friday, September 16. On the date of the installation, Reliable arrived at 361 Adams Drive instead and installed fencing on John Vaccaro's home. Vaccaro was at home eating breakfast when the company arrived and began to install fencing around his property. Although he had not contacted the company, he continued watching them while they worked. Reliable discovered their mistake after they received a call from the Hendersons. The company immediately sent a bill for the work to Vaccaro who refused to pay. Is he required to?