We received a written quote from a landscaper and agreed to go ahead. The quote involved fencing and landscaping. The total cost $13 136. There was no contract. The landscaper began work on the fences and has put in the posts but not the panels. The cost of the fences alone was $4450. We have paid him $3000. Then he started making excuses for not showing up. We rang Fair Trading and discovered that he is not licensed (his licence expired in 2016). We would like to end our agreement with him. We think we have paid enough for the work he has done already. Could he rightfully sue us for more money?