Chu Kang, a contractor, entered into a contract with Beng to renovate Beng's house at a cost of $150,000. Amongst other things the contract required Chu Kang to construct a koi pond with a water fall feature in the garden and to paint the entire interior and exterior of Beng's house with at least 2 coats of paint. On 16th May, Chu Kang had completed the renovations. When filling the koi pond with water, Beng noticed that the garden was flooded. On checking, he discovered that water was seeping out from the sides of the koi pond. He also noticed that the paintwork on the walls was very thin. Beng told Chu Kang that he was not accepting "such shoddy workmanship". Chu Kang refused to repair the koi pond or add another coat of paint to the walls. Beng had no choice but to engage another contractor to repair the koi pond and apply another coat of paint to the walls. This cost Beng $3,000. Explain with reasons whether Beng has the right to refuse to pay Chu Kang.