Problems with car sales on order, please take a look what would be possible… ?

Hello people, and I’m not sure if I ended up here in the right forum. I have the following problem, which I like pain at the moment. Facts: I got the order from a very well-loved workshop (Mündlich nicht Written) to sell a car for a customer who would like to have 600€ for the car. Said, I immediately got to work and advertised the car professionally. However, the selling price was 140€ above and d The owner of the workshop (whose name I don’t want to name here, for data protection reasons) told me in a personal conversation that I can sell the car for the customer, and I can put the amount that goes over the 600€ out (in this case 140€) in my pocket. Since I have already done several services under my hand. Now however, the problem that the workshop says , you get a third of its what you earned from that part” and the rest we share among ourselves. That would be in the case of 433,33€ for 3 people, in which are included I as a seller, the workshop owner and an employee. Now, however, I wonder if this is so right and if I have a right to demand my money amount. I have the purchase contract with my signature here at home, with my data and the data of the buyer. Where is my right here? Can I get the work Or do my chances look bad? Would be grateful for EVERY Helpful answer on your part, and I count on you. I am aware that it was not right to sell the car on behalf of me. But it’s all about a proud sum of money…