Appliance Repairman

I have a rental condo. My tenant called that the dishwasher was not cleaning the top drawer dishers. I asked her to call Appliance repairman. She was quoted 80 dollars for the service and if any work is done there would be additional cost but 80 dollars would be waived. I spoke to technician after he inspected the unit and told me what needed to be replaced Total cost would be 280 dollars. I asked to go ahead and paid him with visa after he had done the job. The bill stated that it needed more parts over 600 dollars. The technician did not tell me that on the phone but it was on bill that my tenant signed. I purchased a new dishwasher from Leons. .