Hello. I run my own business as a handyman. I was recently retained by a bathroom renovation company to do some "finishing off" (repairs, painting, woodwork etc). I have worked for this company on several other occasions without incident. Unfortunately this time they have considered my invoice to be excessive and have only paid 54%. They did not ask for a quote, nor was one provided. The scope of work was assessed and agreed would take one week. There were additions mid-way and the invoice was sent out for 52 hours + materials + GST. How do I stand legally under contract law to recover the balance? Your advice is much appreciated, thank you.