Dear solicitors: I signed a contract for purchasing an off-the-plan townhouse 5 months ago. In attachment B, the specification states that the roof is tile with brand Boral, but the plan illustrates that the roof would be color bond (the words are small and unclear). The vendor stated (by agent) that the townhouse would have tile roof. However, the vendors ask me to agree with their plan to use colorbond instead of tiles because this is the requirement of the city council. Can I take legal action under property law for compensation?